A surface disease repair system and method for an infrastructure based on climbing robots are provided. The system includes a detection and marking climbing robot and a repair climbing robot. In the process of moving on a surface of an infrastructure to be detected, the detection and marking climbing robot collects a front surface image in real time through a binocular camera arranged at a front end, detects a disease on the basis of the front surface image, and performs localization and map reconstruction at the same time; when a disease is detected, the position of the disease is recorded, and a marking device is controlled to mark the disease; after detection and marking are completed, the position of the disease and the map are sent to the repair climbing robot; and the repair climbing robot receives the map and the position of the disease, reaches the position of the disease, and repairs the disease according to the mark by using a repair device.

The invention relates to a printing device (10) for a 3D printer. The printing device comprises a metering unit (18) for melting and plasticizing a material (38) to be printed and a delivery unit (14) for printing the material (38) provided via the metering unit (18). The metering unit (18) and the delivery unit (14) are arranged separately from each other and can be connected to each other, wherein the delivery unit (14) can be transported to the metering unit (18) in order to receive material (38) and, in order to connect the delivery unit (14) to the metering unit (18), a nozzle (74) of the delivery unit (14) and a coupling point (62) of the metering unit (18) come into contact with each other.

The invention described herein provides a dry graphene powder composition comprising pristine graphene flakes, wherein the pristine graphene flakes are non-covalently functionalised with polymeric amphiphilic molecules and wherein the dry graphene powder composition is capable of forming a stable homogeneous dispersion in aqueous or alcoholic media, in the absence of free dispersants or stabilizers, as well as methods for producing same, and the use thereof in graphene inks, for 2D and 3D printing, for production of flexible circuits, electrodes, electrocatalysts, for fabrication of nanocomposites and for wet-spinning of pristine graphene fibers.

Provided are a cellulose composite material, a three-dimensional (3D) printing material and a 3D printing structure including the cellulose composite material, and a method of manufacturing a 3D printing structure using the cellulose composite material. The cellulose material may be used as a 3D printable eco-friendly material using cellulose that is an eco-friendly natural material and a compound having a catechol group that is derived from nature, and a structure implemented with 3D printing has excellent tensile strength or compressive strength.

A method for fabricating a collagen bio-ink includes steps as follows. A first component is provided, wherein the first component is to fill a collagen powder to a first syringe. A second component is provided, wherein the second component is to fill a neutral solution or an acid solution to a second syringe. A mixing step is performed, wherein the first syringe is connected to the second syringe with a Lure lock connector and pushing back and forth to mix the first component and the second component to form a hydrogel and become a collagen bio-ink.

Some variations provide a composition for additive manufacturing (3D printing) of metals, comprising: from 10 vol % to 70 vol % of a photocurable liquid resin; from 10 vol % to 70 vol % of metal or metal alloy particles, optionally configured with a photoreflective surface; and from 0.01 vol % to 10 vol % of a photoinitiator. Other variations provide a composition for additive manufacturing of metals, comprising: from 1 vol % to 70 vol % of a photocurable liquid resin; from 0.1 vol % to 98 vol % of an organometallic compound containing a first metal; from 1 vol % to 70 vol % of metal or metal alloy particles containing a second metal (which may be the same as or different than the first metal); and from 0.01 vol % to 10 vol % of a photoinitiator. Many examples of metals, photocurable resins, organometallic compounds, photoinitiators, and optional additives are disclosed, and methods of making and using the composition are described.

Some variations provide a composition for additive manufacturing (3D printing) of metals, comprising: from 10 vol % to 70 vol % of a photocurable liquid resin; from 10 vol % to 70 vol % of metal or metal alloy particles, optionally configured with a photoreflective surface; and from 0.01 vol % to 10 vol % of a photoinitiator. Other variations provide a composition for additive manufacturing of metals, comprising: from 1 vol % to 70 vol % of a photocurable liquid resin; from 0.1 vol % to 98 vol % of an organometallic compound containing a first metal; from 1 vol % to 70 vol % of metal or metal alloy particles containing a second metal (which may be the same as or different than the first metal); and from 0.01 vol % to 10 vol % of a photoinitiator. Many examples of metals, photocurable resins, organometallic compounds, photoinitiators, and optional additives are disclosed, and methods of making and using the composition are described.

A magnetic ink composition for three-dimensional (3D) printing a bonded magnet is provided. The magnetic ink composition includes magnetic particles, a polymer binder and a solvent. A 3D printing method for fabrication of a bonded magnet using the magnetic ink composition is also provided.

A magnetic ink composition for three-dimensional (3D) printing a bonded magnet is provided. The magnetic ink composition includes magnetic particles, a polymer binder and a solvent. A 3D printing method for fabrication of a bonded magnet using the magnetic ink composition is also provided.

The material feeding device is configured so that in the state in which a hopper having an opening part and containing a material is attached to a coupling member configured so that the hopper is detachably attached to the coupling member, when the hopper is located in a first area, a first member configured to be able to make a sliding displacement on a slide surface having the first area where a feed hole is disposed makes the sliding displacement to a third area different from the first area to make it possible to take a communicated state in which the opening part and the feed hole are communicated with each other, and when the hopper is located in a second area, the first member makes a sliding displacement to the first area to make it possible to take a non-communicated state in which the first member covers the feed hole. The material feeding device takes the non-communicated state at least when the hopper is detached from the coupling member via a detachably attaching part disposed in the second area extending along a direction in which the first area extends.