According to some aspects, a method is provided of forming a metallic object via additive fabrication, the method comprising obtaining a geometric description of a first object with an exterior surface, generating a geometric description of a second object, the second object bounded by the exterior surface of the first object and having one or more voids, fabricating said second object via additive fabrication based on said geometric description of the second object, and depositing a metallic material onto said second object, wherein the metallic material is deposited into said voids of second object.

Three dimensional (3D) printed molds having breakaway features are disclosed. An example method for forming a mold having a cavity by creating a plurality of layers using an additive manufacturing process includes providing a build material and varying a fusion level applied to the build material to form a first fused area and a second fused area on a layer of the mold, the second fused area is to define a breakaway feature of the mold.

A mandrel mold tool for forming a mandrel includes a plurality of mandrel mold tool members that are configured for fastening together to form a mandrel mold tool having an internal compartment. The plurality of mandrel mold tool members each include an outer wall, an inner wall adjacent the outer wall, and an interior portion between the outer wall and the inner wall. The interior portion has a sparsely-infilled structure that is substantially permeable to fluids. The outer wall has a port for receiving a hardening fluid. The inner wall has a plurality of through-holes such that the hardening fluid, upon being introduced via the port, passes through the interior portion and the plurality of through-holes for hardening a sacrificial mold disposed in the internal compartment.

Disclosed is a method for manufacturing a flexible three-dimensional structure, characterised in that it includes the following steps: preparing a temporary mould defined by a peripheral surface; positioning a support structure on at least one portion of the peripheral surface of the temporary mould; decomposing the temporary mould; and extracting the decomposed temporary mould.

A mold includes a first section, a second section, and a weakened region that joins the first section to the second section. The weakened region is breakable, deflectable, or deformable in response to a first threshold force to enable the first section to be removed from a shell independently of the second section after the shell is formed over the mold. The first threshold force is less than a second threshold force that would damage or permanently deform the shell. The first section is a first mold of at least a portion of one or more first teeth of a dental arch and the second section is a second mold of at least a portion of one or more second teeth of the dental arch.

A direct inkjet printing system for fabricating a part by an additive manufacturing process includes an ink delivery system operative to circulate the ink, a printhead associated with the ink delivery system, the printhead operative to dispense ink from the ink delivery system through a plurality of nozzles and based on a defined pattern, a building table for receiving the dispensed ink one layer at a time based on the defined pattern, wherein the part is formed from a plurality of layers of the ink dispensed from the printhead and a drying station operative to perform a drying process on layers of the ink dispensed from the printhead on a per layer basis.

A method includes determining a first shape of a main body of a mold associated with a dental arch for a patient. The method further includes determining a second shape of a separable feature of the mold. The method further includes determining a third shape and configuration of a receiving element of the main body to receive the separable feature. The method further includes outputting instructions for fabricating the separable feature and the main body that includes the receiving element for receiving the separable feature.

A method of manufacturing a carbon fiber wheel rim is provided, including flowing steps of: preparing a core ring, including a core material which is disintegrable and annular; continuously obliquely winding at least one first dry carbon yarn around the core ring, to form a first semifinished rim; placing the first semifinished rim in a mold, and performing vacuuming, resin injection and thermoforming, to form a second semifinished rim; removing the second semifinished rim out of the mold, and disintegrating and removing the core material.

A method of producing an in-situ molded concrete object includes positioning a form on a substrate. The form can include a leg portion, a face portion, and a frangible portion. The frangible portion can connect the leg portion to the face portion. The method includes coupling the leg portion to the substrate to create a container open on at least one side. The method also includes pouring concrete into the container. The frangible portion can be fractured to separate the face portion from the leg portion.

A radius filler includes a plurality of fibers encapsulated in resin and braided into a braided radius filler. The braided radius filler has a substantially triangular shape with concave radius filler side surfaces and a substantially planar radius filler base surface.