Racing Seat

Sand molds used for laminate templates

The Elefant Racing team of the University of Bayreuth proves that sand molds from a 3D printer are not just used as metal casts but are also ideally suited for laminate templates. Students at the university are building the new seat for their race car on the basis of a sand mold printed by voxeljet.

The idea of using printed sand molds as positive molds for laminating is as simple as it is ingenious. Artur Horn, team manager of Elefant Racing, summarises the advantages for the production of the race car seat: "The positive mold gives us the option of 'test-sitting' the new seat before laminating, and to make adjustments if necessary.

A sand mold is ideally suited for this purpose, since it can be easily machined with sanding and scraping. However, the current mold from the voxeljet printer was a perfect fit from the start."

The seat was printed at the voxeljet service centre exactly according to the design template in the form of several individual components, which were subsequently assembled. Particularly in cases where sand molds will be used multiple times, voxeljet recommends that they are filled and sanded prior to laminating, and that a separation layer is applied. 

During the laminating process, carbon fibre mats are placed over the printed mold and coated with epoxy resin. This process is repeated until the desired material thickness has been achieved. Finally, the seat was put in a vacuum-packed plastic bag and was cured at room temperature.

 Technical data

Total size 680 x 590 x 320 mm 
Weight 63.5 kg
Individual pieces4
Material Sand
Layer thickness  0.3 mm
Lead time 5 days
Build time 13.5 hours