Avoid scratches on whatever surface supports your P3Steel! These little plastic feet have grooves so that the P3Steel 3mm frame slots in directly.
Note that the front parts have a simple "I" shape groove, whereas the back parts have an asymmetrical "T" shape groove and need to be printed in left and right versions (mirror the part with the slicer software before printing).
Los soportes traseros (con el corte en "T") deben ser imprimidos uno de cada vez, el izquierdo "mirrored" del derecho. El mirrorring se puede hacer con el software de slicing (Cura, etc).
After printing, just add felt pads and you'll have less vibration and noise from your P3Steel (I am using these on both my P3Steel's).
OpenSCAD sources included so you can remix these to your taste!
Print in PLA or ABS with 35% infill. Note the back parts are not identical (should be printed separately, first print one, then mirror it in your slicing software (e.g. Cura, etc), whereas the front parts are symmetric.