The “Goliath” manufacturing system, newly developed by the German startup Teu2tec GmbH, allows rapid 3D printing of large format objects from any type of pellets using the paste extrusion modeling (PEM) process. For this purpose, the system uses classic two-component polyurethane binders with fast hardening times and granulates with grain sizes up to 2.00 mm. Due to the rapid hardening of the material
PEM printing method
For this project, Teu2tec used elastomer-based granules (EPDM) and a polyurethane binder as treatment materials. The aim of the project was to develop a system that allows precise mixing and dosing between the two components and to produce thin printed layers that meet high quality requirements.
The special design of the print head enables the printing of highly viscous pastes. “Due to the very short pot life of less than 10 seconds, we can currently work here with print speeds of up to 300 mm/s, with a mass throughput of up to 100 g/s. . That, already, is very impressive! explains Jens Mikus, development engineer at Teu2tec.
The layer height can be adjusted from 3 mm to 12 mm, which not only enables fast printing processes but also, due to the low layer height, optically complex components can be realized. With 2200 x 2200 x 2000 mm, the volume is large enough to be used, for example, to design furniture or complete play equipment for urban design.
Discontinuous and underwater printing
In a first series of tests, the Teu2tec team has already succeeded in fitting and repositioning the print head during the active printing process. With the process technology used, an interruption of the extrusion during the additive process is realized and the repositioning is made possible without printing paste leaking from the nozzle anymore.
The first underwater printing tests have been carried out since the beginning of 2022. It is already becoming clear that the process, with suitable binder systems, allows the printing of components under water. In this way, the scope of application is significantly expanded and classifies this printing process as a highly flexible and unique manufacturing process. The Teu2tec team is currently looking for partners to further develop the technology, to drive the production process and for investors.
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