Print three times the STL file with a high infill rate. I used PETG filament with 66% infill to get really solid parts. You will also need: - 3x M6 threaded brass insert - 3x 38 mm rubber foot - 3x M6 x 20 mm hex screw - 3x M6 spring washer - 12x M3 x 8 mm hex screw - 12x M3 washer Assembly: - Install the brass inserts wit a soldering iron in the printed parts. - Screw the rubber feet onto the printed parts using the hex screw and a washer ring per foot. - Install the assembled feet to your OpenBeam Kossel Pro with 4x M3 x 8 hex screw + 4x M3 washer per foot.