Inspecting an MJF 3D printed part with a CT scanner

August 01, 2022

Multi-Jet Fusion (MJF) is a 3D printing process developed by HP that uses inkjet heads to selectively apply a fusing agent to plastic powder. MJF parts resemble SLS prints, and the process has become popular because it produces strong, functional parts at high volume with cost-effective operation.

Like all 3D printing processes, MJF requires specialized design knowledge and careful post-processing to achieve optimal results. An industrial CT scanner can quickly pinpoint invisible problems that can lead to part failure.

Internal features can trap unfused powder, requiring design revisions or painstaking manual post-processing. This trapped powder is outwardly invisible, but easy to find with a CT scanner.

The MJF process offers excellent thermal control during printing, resulting in parts with low porosity and good surface finish. Here our CT scan shows a generally high-quality surface finish with a slight uniform roughness.

Thermal printing processes can introduce warping and other dimensional problems. This part turned out well, however; the Lumafield logo is sharp, and even the fine internal channel stays close to its 1 mm nominal diameter throughout its length.

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