Methods, systems, and apparatus, including computer programs encoded on computer storage media, for working with three-dimensional object models for printing. One of the methods includes determining a plurality of infill structures in a slice of an object; and determining a path for the tool-head to create the plurality of infill structures including: determining a first portion of the path for deposition of a first infill structure during a first time period; determining a second portion of the path for deposition of one or more second infill structures that are not adjacent to the first infill structure during a second time period; and determining a third portion of the path for deposition of a third infill structure that is adjacent to the first infill structure, wherein the second time period is determined to allow the first infill structure to cool before deposition of the third infill structure.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for working with three-dimensional object models for printing. One of the methods includes determining a plurality of infill structures in a slice of an object; and determining a path for the tool-head to create the plurality of infill structures including: determining a first portion of the path for deposition of a first infill structure during a first time period; determining a second portion of the path for deposition of one or more second infill structures that are not adjacent to the first infill structure during a second time period; and determining a third portion of the path for deposition of a third infill structure that is adjacent to the first infill structure, wherein the second time period is determined to allow the first infill structure to cool before deposition of the third infill structure.

This disclosure may generally relate to additive manufacturing operations and, more particularly, to systems and methods for three dimensional (3D) printing a sealing element. Specifically, examples of the present disclosure may be implemented to manufacture a sealing element which may be disposed in a wellbore to seal off a portion of a well.

This disclosure may generally relate to additive manufacturing operations and, more particularly, to systems and methods for three dimensional (3D) printing a sealing element. Specifically, examples of the present disclosure may be implemented to manufacture a sealing element which may be disposed in a wellbore to seal off a portion of a well.

A support is coupled to an appliance to decrease warpage. The support may comprise a plurality of extensions coupled to the appliance to decrease warpage. The extensions can be coupled to the appliance at one or more of many locations, such as on an occlusal surface, a wall, an edge or an interior of the appliance. In some embodiments, the extensions are coupled to walls of the appliance such as a buccal wall and a lingual wall, and the extensions can be coupled to the walls of the appliance near edges of the walls, such as gingivally facing edges of the walls that are oriented toward the gingiva when the appliance is worn.

A single screw extrusion sprayer of a 3D printer includes a drive mechanism, a stir mechanism, and an extrusion mechanism. A side of the drive mechanism is connected to the stir mechanism to drive the stir mechanism to rotate, and another side of the drive mechanism is connected to the extrusion mechanism to drive the extrusion mechanism to rotate. The extrusion mechanism is connected to the stir mechanism to deliver stirred particles to the stir mechanism. The single screw extrusion sprayer has a compact structure and a light weight, and can be used in desktop 3D printers. The particle material can be melted for 3D printing.

A single screw extrusion sprayer of a 3D printer includes a drive mechanism, a stir mechanism, and an extrusion mechanism. A side of the drive mechanism is connected to the stir mechanism to drive the stir mechanism to rotate, and another side of the drive mechanism is connected to the extrusion mechanism to drive the extrusion mechanism to rotate. The extrusion mechanism is connected to the stir mechanism to deliver stirred particles to the stir mechanism. The single screw extrusion sprayer has a compact structure and a light weight, and can be used in desktop 3D printers. The particle material can be melted for 3D printing.

A system and method for improving additive manufacturing, including additive manufacturing toolpaths, is provided. The system and method includes a toolpath generator that obtains initial toolpaths of an object, identifies isolated paths in the toolpaths, and adds bridge connections between neighboring isolated paths in each layer to improve the toolpaths. The bridge connections facilitate the continuous and non-stop deposition of each layer according to improved toolpaths during additive manufacture, which can reduce total deposition time and improve the resultant additive manufacture.

This patent application claims the use of directed energy in the form of electronically scanned ion beams to form plastic parts by selectively curing commodity or engineering resin in the shape of the part. Polymerization is limited to the vicinity of the controlled Bragg-peak of the ion beam (i.e., where linear energy transfer is maximized), if necessary, by the use of chemical polymerization inhibitors or conditions that inhibit polymerization.

Disclosed are 3D-printed scaffolds having high bone cement content, and in particular, high hydroxyapatite (HA) content. The disclosed methods and compositions provide the ability to print biocompatible scaffolds having patient-specific geometries with controlled porosity, microstructure, osteoconductivity, and mechanical strength. The scaffolds may be used for in vitro and in vivo craniofacial and dental applications.