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Technical University of Munich

3D-Printing Parameter for Selective Laser Sintering (EOS Formiga 100)

Parts printed in already assembled configuration:

The parameter explained here were valid for a EOS Formiga 100 after calibration using unused PA powder.

In case that components are printed on the SLS Formiga 100 in an assembled configuration, I recommend to have

  • a minimal wall thickness of 0.5 mm (flexible such as wood veneer of the same thickness)
  • usable stiffness comes with 1.5 mm thickness
  • the outer radius of a bold must be 0.3 mm smaller than the radius of hole  (slot=0.3mm) in this case heavy force and torque is required to loosen the connection after printing.
  • if the outer radius of a bold is 0.4 mm smaller than the radius of hole (slot=0.4mm), some force and torque is required to loosen the connection after printing.
  • if the outer radius of a bold is 0.5 mm smaller than the radius of hole (slot=0.5mm), the parts are completely separated after printing, but have a reasonable play. 

Parts printed to be assembled afterwards (PA):

In case that components are printed on the SLS Formiga 100 to be assembled afterwards, I recommend to have

  • a minimal wall thickness of 0.5 mm (flexible such as wood veneer of the same thickness)
  • usable stiffness comes with 1.5 mm thickness
  • the outer diameter of a bold can have the same inner diameter of a hole (slot=0.0mm). There is some friction but it will disappear because of the compression of the particles when in movement.
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