Much like the HSS process, MJF involves jetting a radiation-absorbing fluid (aka the fusion agent) to certain areas of a bed of polymer powder. The build platform is then lowered, a fresh layer of powder is deposited, and the process repeats itself layer-by-layer until the 3D part is printed. Once exposed to IR light, the ink-infused powder absorbs the heat, sintering and fusing it into a solid layer, leaving the unprinted areas as loose powder. An inkjet printhead then moves across the platform and jets an infrared-reactive ink to select areas of the powder bed. So how does HSS work? It starts off by applying a thin layer of polymer powder to a heated build platform.
In this special edition review, we’ll run through the ins and outs of these three technologies and see how they differ from one another. Since all processes feature similar properties and surface finishes, it’s not uncommon for these polymer printing technologies to be seen as competitors. The approach utilizes a high-power laser beam, together with a scanning system, to 3D print parts in a bed of polymer powder. Unlike HSS and MJF, which are inkjet-based processes, SLS is a form of laser powder bed fusion. HP offers engineering-grade polymer parts for both functional prototyping and end-use production, seeing use in industries such as automotive and consumer goods.
Similarly, MJF is a sibling under the binder jet banner. The firm has since packed out its product portfolio with several HSS-powered 3D printers such as the VX200 HSS and VX1000 HSS.
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Since obtaining a license to commercialize the technology in 2016, voxeljet has developed its own version of HSS and launched its first HSS 3D printer back in 2017. It’s known for its fast print speeds and large part production capabilities.
Originally invented by Neil Hopkinson at the University of Loughborough and Sylvia Monsheimer at Evonik at the same time in the early 2000s, HSS is a powder-based 3D printing process similar to binder jetting. As such, competition between industrial 3D printer OEMs is fiercer than ever, giving manufacturing firms ample choice with technologies such as High Speed Sintering (HSS), Multi Jet Fusion (MJF), and Selective Laser Sintering (SLS). The market for polymer 3D printing is rapidly growing, with reports that polymer powder consumption grew by 43.3% throughout 2021, overtaking photopolymer resins as the most used 3D printing material.
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