3D PRINTING PEN

Abstract

A three-dimensional printing pen includes a barrel open on a first end and having an opening for receiving a melt-substrate on a second end, opposite to the first end. A nozzle is configured to receive and melt said melt-substrate and arranged to be connected to the first open end of the barrel The pen further includes a channel inside the barrel with a first opening adjacent and aligned with the opening in the barrel for receiving said melt-substrate and a second opening, opposite to said first opening, adjacent to the nozzle. A transport mechanism has a rotatable transport member which is, in use, in contact with the melt-substrate for moving the melt-substrate through towards the nozzle.

Claims

1. A three-dimensional (3D) printing pen comprising: a barrel open on a first end and comprising an opening for receiving a melt-substrate on a second end, opposite to the first end, a nozzle configured to receive and melt said melt-substrate and arranged to be connected to the first open end of the barrel, a transport mechanism comprising a rotatable transport member which is, in use, in contact with the melt-substrate for moving the melt-substrate towards the nozzle, and a channel inside the barrel comprising a first opening adjacent and aligned with the opening in the barrel for receiving said melt-substrate, a second opening, opposite to said first opening, adjacent to the nozzle and a third opening configured such that said melt-substrate is between said rotatable transport member and an internal surface of said channel for supporting the rotatable transport of said melt-substrate when said rotatable transport member is rotated

2. The three-dimensional (3D) printing pen according to claim 1, further comprising a heat dissipating member for assembling said nozzle to the open first end of the barrel, wherein the heat dissipating member is positioning said nozzle at a distance from the barrel.

3. The three-dimensional (3D) printing pen according to claim 2, wherein the heat dissipating member comprises holes, openings or perforations for dissipating heat when the nozzle is heated.

4. The three-dimensional (3D) printing pen according to claim 1, further comprising at least two buttons configured to control the speed or movement direction of the melt-substrate inside the channel, wherein activating a first button is configured to move the melt-substrate with a first speed from the first end of the barrel to the second end of the barrel and wherein activating a first and second button simultaneously is configured to move the melt-substrate from the second end to the first end of the barrel.

5. The three-dimensional (3D) printing pen according to claim 1, further comprising a light source configured to indicate the moment at which the pen is ready to be used.

6. The three-dimensional (3D) printing pen according to claim 2, wherein said rotatable transport member is a worm gear.

7. A three-dimensional (3D) printing pen according to claim 2, wherein said heat dissipating member is made of a material having a thermal conductivity lower than 0.5 W/m.Math.K.

8. The three-dimensional (3D) printing pen according to claim 7, wherein the heat dissipating member comprises holes, openings or perforations for dissipating heat when the nozzle is heated.

9. The three-dimensional (3D) printing pen according to claim 7, wherein the heat dissipating member is configured to surround the nozzle.

10. The three-dimensional (3D) printing pen according to claim 1, further comprising a temperature microcontroller, wherein the temperature microcontroller is configured to maintain the nozzle at a predetermined temperature for melting the melt-substrate.

11. A three-dimensional (3D) printing pen comprising: a barrel open on a first end and comprising an opening for receiving a melt-substrate on a second end, opposite to the first end, the direction from the first end to the second end of the barrel being the length direction of the pen, a nozzle configured to receive and melt said melt-substrate and arranged to be connected to the open first end of the barrel, a transport mechanism comprising a rotatable transport member which is, in use, in contact with the melt-substrate, wherein the rotatable transport member is rotating around an axis in the length direction of the pen for moving the melt-substrate in the length direction of the pen.

12. The three-dimensional printing pen according to claim 11, wherein the pen further comprises a channel inside said barrel comprising a first open end adjacent and aligned with said opening in the barrel for receiving said melt-substrate and a second open end, opposite to said first open end, adjacent to the nozzle, wherein said channel comprises a third opening for receiving a portion of said rotatable transport member and wherein said melt-substrate is between said rotatable transport member and an internal surface of said channel for supporting transport of the melt-substrate when said rotatable transport member is rotated.

13. The three-dimensional printing pen according to claim 12, wherein said channel comprises an indentation at a position opposite to the third opening for receiving a portion of said rotatable transport member.

14. The three-dimensional printing pen according to claim 11, wherein said rotatable transport member is a worm gear.

15. A three-dimensional (3D) printing pen comprising: a cylindrical barrel open on a first end and comprising an opening for receiving a melt-substrate on a second end opposite to the first end, and an inside assembly configured to be moved at least partly in the cylindrical barrel comprising at least two structure parts, at least one connection part for positioning the at least two structure parts relative to each other, a nozzle configured to receive and melt said melt-substrate and arranged to be connected to the first open end of the barrel, a transport mechanism comprising a rotatable transport member which is, in use, in contact with the melt-substrate for moving the melt-substrate towards the nozzle, and a channel having a first opening adjacent and aligned with the opening in the barrel for receiving said melt-substrate, a second opening opposite to said first opening and adjacent to the nozzle, and a third opening configured such that said melt-substrate is between said rotatable transport member and an internal surface of said channel for supporting the rotatable transport of said melt-substrate when said rotatable transport member is rotated.

16. A three-dimensional (3D) printing pen according to claim 15, further comprising a heat dissipating member surrounding said nozzle.

17. A three-dimensional (3D) printing pen according to claim 16, wherein the heat dissipating member comprises holes, openings or perforations for dissipating heat when the nozzle is heated.

18. A three-dimensional (3D) printing pen according to claim 15, further comprising at least two buttons on the barrel configured to control the speed or movement direction of the melt-substrate inside the channel, wherein activating a first button is configured to move the melt-substrate with a first speed from the first end of the barrel to the second end of the barrel and wherein activating a first and second button simultaneously is configured to move the melt-substrate from the second end to the first end of the barrel.

19. A three-dimensional (3D) printing pen according to claim 15, further comprising a light source configured to provide an indication of the readiness of the pen to be used.

20. A three-dimensional (3D) printing pen according to claim 15, wherein said rotatable transport member is a worm gear, the pen further comprising a pressure part configured to be provided on the channel of the inside assembly at a position opposite to the worm gear and configured such that after assembling the pressure part is between the barrel and the channel.

21-23. (canceled)

Description

[0046] FIG. 1A is an illustration of a 3D printing pen according to an embodiment of the present invention.

[0047] FIG. 1B is an exploded view of a 3D printing pen according to the embodiment of the invention of FIG. 1A.

[0048] FIG. 2 is an illustration of the internal structure of a preferred 3D printing pen according to an embodiment of the invention.

[0049] FIG. 3 represents a view of a transport mechanism and a channel of a particular 3D printing pen of the present invention.

[0050] FIG. 4a represents a preferred embodiment of a transport mechanism with a channel of a 3D printing pen of the present invention.

[0051] FIG. 4b is a view of an advantageous channel of a 3D printing according to the present invention.

[0052] FIG. 4c is another view of an advantageous channel of a 3D printing pen of the present invention.

[0053] FIG. 5a is a view of a transport mechanism according to an embodiment the present invention.

[0054] FIG. 5b is a view of the transport mechanism of FIG. 5a.

[0055] FIG. 6 is a perspective view of a transport mechanism according to an embodiment of the invention.

[0056] FIG. 7A is a first perspective view of an inside assembly of a 3D printing pen according to an embodiment of the present invention.

[0057] FIG. 7B is a second perspective view of the inside assembly of FIG. 7A.

[0058] FIG. 8A is a side view of the inside assembly of FIG. 7A.

[0059] FIG. 8B is a top view of the inside assembly of FIG. 7A.

[0060] FIG. 9A is a perspective view of a pressure part used in a 3D printing pen according to an embodiment of the present invention.

[0061] FIG. 9B is a front view of the pressure part of FIG. 9A.

[0062] According to the present invention the three-dimensional (3D) printing pen comprises a barrel open on a first end and comprising an opening for receiving a melt-substrate on a second end, opposite to the first end, a nozzle configured to receive and melt said melt-substrate and arranged to be connected to the first open end of the barrel, a channel inside the barrel comprising a first opening adjacent and aligned with the opening in the barrel for receiving said melt-substrate and a second opening, opposite to said first opening, adjacent to the nozzle, and a transport mechanism comprising a rotatable transport member which is, in use, in contact with the melt-substrate for moving the melt-substrate through towards the nozzle. This constitutes an advantageous embodiment of the present invention. The different embodiments of the transport mechanism are disclosed herein after in order to understand the moving of the melt-substrate inside the barrel of the 3D pen.

[0063] Advantageously, the channel comprises a third opening for the rotatable transport member which can by rotation, when the pen is used, be in contact with the melt-substrate which is then pushed against an internal wall of the channel acting as a supporting element for the melt-substrate. This mechanical structure enables to move linearly the melt-substrate inside the channel toward the nozzle wherein the extrusion of the melt-substrate can occur. Some embodiments of the channel according to the present invention are described in the following figures.

[0064] In the present invention, the 3D pen can also comprise a heat dissipating member which can surround the nozzle, be a part of the nozzle or be an additional member extending to the first end of the barrel.

[0065] More precisely, the 3D printing pen of the present invention can have different internal and external structures.

[0066] For example, the 3D pen can comprise a barrel formed by at least one member, preferably at least 2 members, more preferably at least 4 members; and a nozzle. The barrel has a first opening, on which the nozzle is connected, and a second opening to receive the melt-substrate.

[0067] Advantageously, the barrel can comprise an additional member which comprises a first and second ends and two buttons to control the movement of the melt-substrate inside the channel. In that preferred configuration, the first end of the additional member is connected to the first open end of the barrel and the second end of the additional member is connected to an end of the nozzle.

[0068] More preferably, the heat dissipating member area is located between the nozzle where the extrusion of the melt-substrate is carried out and the first opening of the barrel. In the meaning of the present invention, the expression first or second open end of the barrel means the first or the second end of the barrel.

[0069] So, when the extrusion occurs, it is advantageous to manage the heat generated during the extrusion to prevent an overheating inside the 3D printing pen.

[0070] The nozzle of the 3D pen according to the present invention can comprise a heat dissipating member which enables to correctly manage the heat generated during the melting of the melt-substrate.

[0071] FIG. 1A illustrates a 3D printing pen 1 according to a preferred embodiment of the invention. The illustrated 3D pen 1 comprises a barrel 2 and a nozzle assembly 3. The barrel 2 comprises a first end 2a and a second end 2b. The first end 2a is open to be connected to the nozzle assembly 3. The second end 2b has an opening for receiving a melt-substrate (not illustrated). The barrel 2 further comprises an additional member 2g. In an alternative embodiment the additional member 2g is part of a body 2f of the barrel. The additional member 2g has a first end, a second end and two buttons 5, 6. The two buttons can be activated and de-activated to control the movement of the melt-substrate inside the pen. The first end of the additional member 2g is connected to the open first end 2a of the barrel 2. The second end of the additional member 2g is connected to the nozzle assembly 3.

[0072] The nozzle assembly 3 comprises a heat dissipating member 4 and a nozzle 31 with an output 7 for the melted melt-substrate. The heat dissipating member 4 is connected to the additional member 2g and comprises holes 4a all over its surface. The nozzle 31 is heated to provide extruded melt-substrate out of the output 7 of the pen 1. By moving the 3D pen 1 when the pen is activated (heated), 3D objects can be created, for example aesthetic 3D objects.

[0073] FIG. 1B illustrates an exploded view of a 3D printing pen 1 of the present invention and illustrates each part constituting the preferred 3D pen 1 of the invention.

[0074] More precisely, the 3D pen 1 of FIG. 1B comprises a barrel 2 formed by four parts which are the body 2f, the additional member 2g, the additional part 2c and the end part 2d. Each of the aforementioned parts 2c, 2d, 2f and 2g of the barrel 2 comprises a first end and a second end. The connection of the four parts enables to form the structure of the barrel 2 which has a first end 2a located on one end of the additional member 2g and second end 2b located on one end of the end part 2d, the second end 2b having an opening for receiving a melt-substrate. The additional member 2g of the barrel 2 is connected to the nozzle assembly 3. As it can be seen from FIG. 1B, the additional part 2c comprises a supporting element 2e (a clip) to attach the pen to an object.

[0075] The end part 2d of the barrel 2 comprises two inputs (not illustrated): one for connecting to a power source such as an USB port of a laptop or other electrical device, or a power supply, and the other for receiving the melt-substrate.

[0076] The heat dissipating member 4 comprises a first part being in contact with one end 2a of the additional member 2g of the barrel 2 and a second part, opposite to the first part, being in contact with the nozzle and located at the end of the 3D pen 1 where the melted melt-substrate is delivered. The heat dissipating member 4 is made of a material having a low thermal conductivity, preferably lower than 0.5 W/m.Math.K. Such a material can be a plastic ceramic composite like the product Accura CeraMAX composite with a thermal conductivity of 0.47 W/m.Math.K or a thermoplastic polymer such as Poly Ether Ketone (PEEK). Other material providing the same benefit are for example the commercially available Clear Vue material with a thermal conductivity of 0.21 W/m.Math.K or PMS-ABS with a thermal conductivity of 0.19 W/m.Math.K. The structure of the heat dissipating member 4 is made of holes which enable to dissipate sufficiently the heat generated to heat the nozzle while the extrusion of the melt-substrate is carried out. Beneficial is the structure as illustrated in the embodiment is that the nozzle 31 is at a distance from the barrel 2.

[0077] So, when the pen is used, the user holds the 3D pen 1 by means of the barrel 2 because the nozzle assembly 3 and especially the nozzle 31 is hot during extrusion.

[0078] In an alternative embodiment, the barrel 2 comprises not 4 parts but less or more parts. In an embodiment, the barrel 2 is made of one part.

[0079] FIG. 2 illustrates an internal structure of an advantageous 3D printing pen 1 according to an embodiment of the present invention. The 3D pen 1 comprises a channel 12 made of two parts 12a and 12b. In an alternative embodiment, channel 12 is made of one part. Channel 12 is connected to the nozzle 31 to guide the melt-substrate from the opening at the second end 2b of the barrel to the nozzle 31. The 3D pen 1 further comprises a transport mechanism 8. The transport mechanism 8 comprises a rotatable member 9 rotated by a motor 8a. In the embodiment of FIG. 2, the 3D pen 1 further comprises a temperature microcontroller 28 (M). In an alternative embodiment, the 3D pen 1 has no temperature controller.

[0080] The channel 12 is located inside the barrel 2 (not shown on FIG. 2 for clarity) and comprises a first opening adjacent and aligned with the opening in the second end 2b of the barrel 2 for receiving the melt-substrate. The channel 12 comprises a second opening, opposite to said first opening, adjacent to the nozzle 31. The channel 12 comprises also a third opening 10 in the side wall of the channel 12 for receiving a portion of the rotatable transport member 9 and an internal wall 11, opposite to the third opening 10 of the channel 12, acts as a counterpart for the rotatable transport member such that in use melt-substrate is forwarded between the rotatable transport member 9 and the internal surface 11 when the transport member 9 is rotated. The channel 12 can partially or totally be made of a thermostable material such as Teflon. In embodiments where the channel 12 is made of two parts 12a and 12b, the channel can be made of two materials.

[0081] The transport mechanism 8 comprises a motor 8a, preferably a planetary motor, and a rotatable member 9 which is in the embodiment of FIG. 2 a worm gear 9. The worm gear 9 is arranged to be, in use, in contact with the melt-substrate for moving it through towards the nozzle 31. Opposite to the third opening 10 of the channel 12, the internal wall 11 of the channel 12 is configured to support the melt-substrate when the pen is used. The Microcontroller 28 is configured to maintain the nozzle 31 at a predetermined temperature (for example, between 200-300 C.) for melting the melt-substrate. For ABS melt-substrate, the operation temperature of the nozzle is maintained at 230 C. For PLA melt-substrate, the operation temperature is maintained at 210 C.

[0082] The understanding of the function of a preferred 3D pen 1 of the present invention is facilitated by combining the teachings contained in the illustrations of the FIGS. 1A and 2 and by explaining what happens when a user is writing on a surface with the 3D pen 1 of the invention.

[0083] For example, when a user wishes to use the 3D pen 1 of the present invention, he connects the 3D pen 1 to a power supply or to a USB port of a laptop and the melt-substrate is fed in the pen through the opening in the second end 2b of the barrel 2, such as an ABS filament. Because the channel 12 is adjacent the opening in the second end 2b of the barrel 2, the melt-substrate is easily placed inside the channel. When the 3D pen 1 is powered, the user can control the movement of the melt-substrate by pushing the buttons 5, 6 on the barrel 2 (see FIG. 1A, 1B). When one of the buttons 5 or 6 is pushed, the motor 8a of the transport mechanism 8 rotates the worm gear 9. The latter is sufficiently in contact with the melt-substrate, which is supported by the internal wall or surface 11 of the channel 12. The rotation of the worm gear 9 enables to move the melt-substrate inside the channel 12 towards the nozzle 31. When the melt-substrate reaches the nozzle 31, its extrusion can start. The nozzle 31 has at that moment the appropriate temperature (for example 200 C.) for melting the melt-substrate. The temperature of the nozzle 31 is controlled by the thermal Microcontroller 28. So, when the melt-substrate reaches the nozzle 31, a melted melt-substrate is provided outside of the pen 1, preferably through the output 7 of the nozzle 31. In that way, the user can create 3D objects.

[0084] FIG. 3 represents another preferred embodiment of the present invention and shows a transport mechanism 13 of a 3D printing pen 1 of the invention when a melt-substrate 14 is present in a channel 16. The transport mechanism 13 comprises a motor 13a and a rotatable transport member 15. The rotatable transport member 15 is in the embodiment of FIG. 3 a concave external gear 15. The concave curve of the gear 15 is chosen for optimal transport of a round shape of the melt-substrate 14. The external gear is positioned on an axis on which is also a bevel gear. The bevel gear interacts with a second bevel gear on an axis of the motor 13a. When the motor 13a rotates, the second bevel gear rotates around the axis of the motor. The second bevel gear rotates the first bevel gear around an axis 90 degrees rotated with respect to the axis of the motor. The rotation of the first bevel gear rotates at the same time the external gear 15 which is on the same axis. The concave external gear 15 is in contact with the melt-substrate 14 such that rotation of the gear moves the melt substrate 14 in the channel 16. The channel 16 comprises a third opening 16a to receive a portion of the external gear 15. At the position of the third opening 16a, the melt substrate is located between the concave external gear and an internal wall (not illustrated in FIG. 3) located opposite to the third opening 16a of the channel 16. When the motor 13a is powered on, the rotation of the gears 13b rotates the concave external gear 15 which, by rotation and by contacting the melt-substrate, moves the melt-substrate along the channel 16 towards the nozzle 31 (not visible on FIG. 3).

[0085] This preferred transport mechanism 13 can be integrated in any structure of a 3D printing pen 1 according to the present invention. For example, it can replace the transport mechanism 8 illustrated in the FIGS. 2 and 4a.

[0086] Referring to FIGS. 5a and 5b, an alternative transport mechanism of the one illustrated in FIG. 3 is shown. The rotatable transport member 51 is in this alternative embodiment gear 51 which is not concave as in FIG. 3 but straight, also called a spur gear. Similar as in the other embodiments, the motor 13a rotates bezel gear 52 which is mounted on axis 57 of the motor 13a. Bezel gear 52 interacts with bezel gear 53 which is mounted on an axis 56. Axis 56 is rotating in a support member 54, 55 which are fixed with respect to the motor or in a single support member or in two separate support members. The interaction of the bezel gears 52, 53 is positioned between the support members 54, 55. The axis 56 is elongated on the other side of the support member 55 to support the spur gear 51. The spur gear 51 is mounted fixed on this elongated part of the axis 56. The position of the spur gear 51 is such that when the spur gear 51 rotates, it moves the melt-substrate 14 in the channel 16 through opening 16a.

[0087] Referring to FIG. 6, FIG. 6 shows a perspective view of the transport mechanism of FIGS. 5a and 5b. Support member 54, 55 are part of axis holder 64 which is fitting on the housing of the motor 13a. The axis 56 for mounting bezel gear 53 and spur gear 51 is mounted with bearings 61 and 62 in holes of respectively support members 54 and 55. In an alternative embodiment, the support members 54, 55 have no bearings and the axis 56 is kept in position by two circlips. The embodiment shown in FIG. 6, further illustrates a channel support 63 to ensure the relative positioning of the channel 16 with respect to the transport mechanism including motor 13a up to gear 51. This relative positioning is important to ensure a smooth transport of the melt-substrate 14 in the channel 16. The channel support 63 is in this embodiment an extending portion on the axis holder 64. The extending portion provides a surface to glue the channel 16 in the correct relative position with respect to the motor and gears. In alternative embodiments the channel support 63 can be structured differently. For example, the channel support 63 can be a snap member to click the channel 16 in position with respect to motor 13a and gears. In still another embodiment the channel support 63 is a separate member from the axis holder 64

[0088] FIG. 4a represents a further embodiment of the invention and shows a channel 19, a nozzle 26, a heating wire 23, an output 24 for the melted melt-substrate and a transport mechanism 20. The transport mechanism 20 comprises a motor 20a and a rotatable transport member 21 in the form of a worm gear 21.

[0089] The channel 19 comprises a first part 19a having an indentation 17 and a third opening 18 located opposite to the indentation 17, and a second part 19b. The second part 19b guides the melt-substrate up to the nozzle 26. The nozzle 26 is heated by a heating wire 23. In an embodiment, the channel 19 is extending into the nozzle 26. In an alternative embodiment the channel 19 is adjacent an opening in the nozzle 26 for receiving the melt substrate 22. The first and second parts 19a and 19b of the channel 19 can be made of different kinds of materials such as plastic, ceramic, Teflon (PTFE) or isolator materials. The second part 19b is preferably made of an isolator material or Teflon. Moreover, the second part 19a of the channel is preferably made of a material which is different from the one of the first part 19a. In an alternative embodiment, the channel 19 is made of a single part.

[0090] In this particular embodiment, the channel 19 is extending from the second end 2b of the barrel 2 to the opening of the nozzle 26 for receiving the melt-substrate. More precisely, the first end 2a of the barrel 2 is preferably located at a distance from the nozzle 26 and the heating wire 23. The nozzle 26 may be part of a nozzle assembly comprising a heat dissipating member which surrounds partly or fully the nozzle 26 and the heating wire 23.

[0091] The heating wire 23 enables to heat the nozzle 26 up to a temperature situated around 200 C. The length of the heating wire 23 is between 1 and 7 cm, preferably between 2 and 6 cm, more preferably between 3 and 5 cm. In an embodiment of the invention, the length of the wire determines the temperature up to which the nozzle 26 is heated.

[0092] The extrusion of melted melt-substrate 25 at the end of the output 24 has a diameter situated between 0.5 and 1 mm, preferably between 0.55 and 0.75 mm, more preferably 0.6 mm. The speed of the extrusion of melted melt-substrate is between 5 and 30 mm/sec, preferably between 15 and 25 mm/sec, more preferably 20 mm/sec.

[0093] The transport mechanism 20 comprises in an embodiment of the invention a planetary motor 20a which receives 40 mA at 3.0 V and has a frequency of rotation less than 90 rpm (revolution per minute), preferably less than 80 rpm, more preferably less than 75 rpm, advantageously less than 70 rpm. The transport mechanism 20 further comprises a worm gear 21) which is in contact with the melt-substrate 22. So, during use of the pen, the worm gear 21 is rotating around an axis in the length direction of the pen, which is in FIG. 4 also the length direction of the channel 19, for moving the melt-substrate 22 in the length direction of the pen or the channel to provide the melt-substrate 22 towards and through the nozzle 26.

[0094] FIG. 4b illustrates a further embodiment of the channel 19a of a 3D printing pen 1 according to the invention. The channel 19a comprises a third opening 18 for receiving a portion of a transport member 21 and an internal surface 17, opposite to the third opening 18 of the channel 19a. Trough the third opening 18, the transport member contacts the melt-substrate and the internal surface 17 functions as a counterpart, i.e. a supporting element, for the transport member 21 such that the melt-substrate is transported between the transport member 21 and the inner surface 17. So, when the melt-substrate 22 is entered in the channel 19a, it is located between the third opening 18 and the internal surface 17 of the channel 19a, which internal surface is located opposite to the third opening 18 of the channel 19a.

[0095] FIG. 4c is an illustration of a preferred channel 19a of the 3D printing pen 1 of the present invention. The channel 19a comprises a third opening 18 and an indentation 17. So, when a substrate 22 is entered in the channel 19a, a part of the melt-substrate 22 is situated between the third opening 18 and the inner surface 17 of the indentation 17. So, when the 3D printing pen 1 comprises such as channel 19a, the transport member 21 has access through the third opening 18 of the channel 19a to be in contact with the melt-substrate 22. When a transport mechanism is powered inside the barrel of the 3D pen 1 of the present invention, the rotatable transport member 21 is in direct contact with the melt-substrate 22 and pushes it against the indentation 17 which supports it. In that way, the melt-substrate 22 can be moved linearly inside the channel 19a towards the nozzle 26 to be extruded.

[0096] The 3D printing pen 1 of the present invention can have different internal and external structures as illustrated in the Figures. However, it is also possible to provide other internal and external structures of the 3D pen 1 by combining the teachings present in each figure with the description of the present invention.

[0097] FIGS. 7A and 7B illustrate two perspective views of the inside assembly 70 of a 3D printing pen 1 of the present invention. FIGS. 8A and 8B illustrate the corresponding side and top view. The inside assembly 70 is assembled before being moved as one assembly piece in the barrel 2. The inside assembly 70 is building up step by step, like a puzzle. There are no screws or other fixing means required. The structure of the assembly exists of a number of structure parts connected by bars 72. In an alternative embodiment, the bars 72 can be replaced by other means which keep the structure parts at a fixed relative position with respect to each other and are not obstructing for the functional parts. There are two types of structure parts, a first structure part 74 with a closed contour and a second structure part 76 with an open contour. The first structure part 74 has a central opening 75 configured to receive and keep in position a printed circuit board (pcb) 78, the channel 12 and the motor 20a. The first structure part 74 has also two openings 73 for receiving two connection bars 72. To build up a first part of the assembly 70, two bars 72a are positioned between two first structure parts 74, which will be numbered 74a and 74b for ease of description. The same will be done for subsequent bars 72. The pcb 78 is moved in position in the openings 75 of the first structure parts 74. The pcb 78 is holding a power connector 80, led indicators 82 and other electronics as needed.

[0098] At the side that the pen has to be further built up, two further bars 72b are connected to the first structure part 74b. The motor 20a is moved in position and a further first structure part 74c is subsequently moved on the bars 72b and the motor 20a. Next to the first structure part 74c is a second structure part 76a positioned. The second structure part 76a has an open contour and the open contour is arranged such that it can be moved over a first end part 86 of a worm gear 84. Worm gear is moved over the axis of the motor such that the worm gear 84 rotates when the axis of the motor 20a rotates as can be seen for example in FIG. 8B. The second structure part 76a can be connected with bars to the first structure part 74c, or the second structure part 76a can be moved on the first end part 86 of the worm gear 84 and connected together to the motor 20a. The second structure part 76a is connected with a further second structure part 76b by two bars 72c. The second structure part 76 has a central opening which is open on top and which is configured to receive an end part 88, 86 of the worm gear 84 and a pcb 90. The second structure part 76 has also two openings 94 for receiving the bars 72, and also an opening at the opposite site of the opening in the contour an opening for the channel 12. The openings of the first structure parts 74a, 74b, 74c and the second structure parts 76a, 76b are all aligned such that over this length the channel 12 will form a straight line when positioned in the openings. Two further bars 72d are connected to the second structure part 76b and connected on there other ends with a further second structure part 76c. Pcb 90 is moved in the openings of the second structure parts 76b, 76c.

[0099] Next to the second structure part 76c, a heat reducing member 100 is connected with two bars to the second structure part 76c. The heat reducing member is avoiding that too much heat is going into the barrel of the pen. The heat reducing member 100 is connected with the nozzle 114 which is creating the heat to melt the substrate.

[0100] The channel 12 made from Teflon is moved into the openings starting at the side of the first structure part 74a through the opening of the second structure part 76b after which the channel is bended to move into the central opening of the second structure element 76c through a central opening of the heat reducing member 100 up to the nozzle 114.

[0101] The nozzle assembly comprises in the embodiment of FIGS. 7A, 7B, 8A, 8B an output 112. The output 112 is made of stainless steel. This material selection ensures a good heat conduction. Alternatively other materials may be used which have a good heat conduction. The output 112 is connected with the heat reducing member 100. A heat dissipating member 4 surrounds the nozzle 114 and part of the output 122 such that a part of the output 112 is free to be able to apply melted substrate to a surface, an object, etc.

[0102] To have the transport mechanism operating well, there must be sufficient pressure between the worm gear 84 and the substrate fed into the channel 12. This is realised in the embodiment of FIGS. 7A, 7B, 8A and 8B by a pressure part 110. After the inside assembly 70 is assembled and before moving the assembly 70 in the barrel 2, the pressure part 110 is positioned on the channel 12 and between the two second structure parts 76a and 76b as shown in FIGS. 7B and 8A. This is at the position where the channel 12 has an opening for the worm gear to contact the substrate and at the opposite side of the opening for the worm gear 84. The pressure part 110 is a half cylinder with an inside diameter substantially the same or slightly larger than the outside diameter of the channel. On the inside surface is substantially in the middle of the surface a protuberance 112 which is acting on the channel 12 when the pressure part 110 is pressed towards the channel 12 as can be seen on FIGS. 9A and 9B. When assembling, with the pressure part 110 put in position on the inside assembly 70, the inside assembly 70 and pressure part 110 are moved together in the barrel 2. The relative positioning is configured such that when both are in the cylindrical inside of the barrel 2, the inside surface of the barrel 2 is in contact with the outside surface of the pressure part 110 and the protuberance 112 of the pressure part is pressing on the outside surface of the channel 12. The pressure on the outside surface of the channel 12 ensures that the inside surface of the channel 12 is pressing the substrate towards the worm gear 84 such that the substrate is moving forward when the worm gear 84 is rotating.

[0103] FIGS. 9A and 9B are illustrating the pressure part 110 in more detail. The end surfaces 114 of the pressure part 110 are in an embodiment of the invention chamfered for ease of moving it into the barrel 2. In alternative embodiments, the end surfaces may be not chamfered. The pressure part 110 is in an embodiment made symmetrical for ease of handling. In an alternative embodiment, the pressure part may be not symmetrical.

[0104] Although the preferred embodiments of the invention have been disclosed for illustrative purpose, those skilled in the art will appreciate that various modifications, additions or substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.