The dimensions of the usable build chamber are 230 x 135 x 250 (h x w x d) and the maximal part weight is limited up to 1500 g. In addition, the freeformer is equipped with a heated build chamber (50 – 100 °C).
Build Time and Build-up Rate
The build time and build-up rate depend on the part geometry, the material, the used nozzle as well as the process parameters. In regard to the parameters, the layer thickness and the traverse speed has to be considered. Generally, the discharge quantity depending on the nozzle size is between 5 and 21 cm3/h.
Surface Quality and Accuracy
With an increasing layer thickness and plastic droplet size, the surface quality is decreasing. Using different nozzle sizes the freeformer generates layer thicknesses between 200 and 320 µm.
ARBURG specified the part accuracy with ± 0.15 mm for using ABS. For the surface quality, the roughness value Ra is listed around 20 µm. The minimal wall thickness varies between 0.6 and 1.0 mm depending on the nozzle size.
So far, the materials ABS, PC, PA12 (amorphous) and TPU are specified for the freeformer. Besides that, the range of materials will be constantly extended to get more qualified standard granulates such as PP for the process.
The open machine control enables the users to vary all the process parameters in consideration of the machine limits, whereby the maximum temperature is 300 °C. Consequently, this system opens up the possibility to use other thermoplastic materials as well.
In the case of complex part geometries, a water-soluble support material based on polyvinylpyrolidon is used.
In general there is no post processing required. If support material was used, it has to be removed. Machining/sanding can be applied to reduce surface roughness.