Talířová podložka / plate washer

I created a small plate washer that I needed to anchor the polystyrene insulation into a narrow niche. For screw 3.5 - 4mm.
For high strength, I printed from PET-G with 99 perimeters set in a slicer (or 100% infill) and baked in the oven in a bath of salt. 230° - 10-15min in about half kilogram of salt.

 The fortress was incredible, very effective, so strong.