Additive Manufacturing Strategies

Cologne University Students Develop Concept Polyjet 3D Printers for Under 10,000€

ST Medical Devices

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There are so many different types of 3D printing technologies on the market. Currently, only fused deposition modeling and stereolithography are used within 3D printers that are targeted toward the consumer market, poly-1mainly due to costs. With that said, there is no doubt that other technologies are faster, print in a wide array of additional materials, and create products of much higher quality.

A Stratasys Polyjet 3D Printer

A Stratasys Polyjet 3D Printer

Probably one of the coolest technologies we have seen is Polyjetting, which is a technology patented by Stratasys, and is found in their Objet Connex 3D printers. The technology works similarly to that of a 2D inkjet printer, but instead of spitting out nano-scale droplets of ink onto paper, a typical Polyjet 3D printer spits out tiny droplets of a photosensitive resin, which is instantly UV-cured. The resulting prints end up being extremely precise, with amazing finishes, and just having an overall awesome appearance to them. Problem? Such printers will run a company or individual between $200,000 – $300,000+. Few businesses, much less individuals, have the capital required to purchase such technologically advanced machines.

This may be about to change, however. According to a source, who would prefer to remain anonymous, Prof. Dr. Jörg Luderich, at the The Cologne University of Applied Sciences, located in Germany, earlier this year assigned quite an interesting Masters’ project for one of his courses. It was to develop a concept for a Polyjet 3D printers which would have a final cost of under 10,000€. In total, six PolyJet printer concepts were submitted, of which Luderich will select one, to possibly be constructed at the University.

We were able to get hold of the designer of one of these six machines, Maher Alwan. In addition to providing pictures of his printer on GrabCad, Anwar also furnished us with some specification that his printer would possess, should it eventually be constructed:

Alwan's Concept Polyjet 3D Printer

Alwan’s Concept Polyjet 3D Printer

  • Max Build Envelope: 100 x 100 x 100 mm (Minor alterations could make it 150x150x100)
  • Z-Axis Movement: 0.001 mm/step
  • Print Speed: 2 m/s

The printer would feature (2) Xaar1001 print heads with an effective resolution of over 1000 dpi a piece.

“Each printhead can be used for two materials since it has two rows with two inputs,” explained Alwan to 3DPrint.com. “This way the printer has one supporting material and three photopolymers with different colors (to make different parts with different colors) or different characteristics (rubbery or hard).”

The bulk of the electronics will be stored in the middle of the machine, meaning that the build envelope is quite spacious, allowing users to get a clear view of the print. The build plate can quickly and easily be removed for cleaning as well.

It will certainly be interesting to see what printer Prof. Dr. Jörg Luderich will choose, and if and when that printer will be built. It is important to note that the technology involved with Stratasys PolyJet printers is in fact patented. How the University would get around this has yet to be seen. Regardless, this could be a major first step in the widespread availability of somewhat affordable PolyJet or Polyjet-like 3D printers. Let’s hear your opinion on these possibilities in the Cheap Polyjet 3D printer forum thread on 3DPB.com.

Alwan's Concept Polyjet 3D Printer

Alwan’s Concept Polyjet 3D Printer

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