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3D Printing Design Guide: MultiJet

Overview

MultiJet 3D printing is a material jetting technology that prints parts from photopolymer resin which is cured by UV light. It offers low layer heights and high XY resolution, making it the highest resolution 3D printing technology we offer. Additionally, with its higher heat resistance compared to PolyJet and its simulation of production plastics, this type of printing is suitable for both prototypes and functioning parts.

When designing parts for MultiJet printing, as with any other 3D printing technology, there are several important factors to consider. This guide will advise you on best practices when designing specifically for MultiJet and help make sure your parts print right the first time.

The Printing Process

As with all other 3D printing technologies, MultiJet slices your design into hundreds or thousands of cross-sectional layers. These layers are reproduced one at a time until your part is complete.

To create each layer, material is melted and emitted as droplets through a print head with a grid of hundreds of holes. The printer head moves over the build tray much like that of an inkjet printer to build the design layer by layer. A UV light passes over each layer after it is completed, hardening the material into a solid plastic. This process is repeated until the part is complete and ready for post-processing.

MultiJet, like PolyJet, has a wax-like support material that is used to support the design as it is printed. Where this differs from PolyJet is that this support material may be melted away in an oven, rather than removed manually. This allows for designs with small or blind cavities that would be impossible to clean if printed with PolyJet. After the support material is melted away, the design goes through a three-step process, which includes an ultrasonic bath, a cleanse for residue, and a final rinse.

Designing for MultiJet

When