Recessed vibration absorber for Prusa I3 mk2

An ultra low profile recessed vibration damper / silencer foot for Prusa I3 mk2 or others, designed to fit in an IKEA Lack table without raising the printer more than about 1.5 mm.

This is not just a springy foot that allows the printer to shake without shaking the table, it's a real shock absorber. The shock absorbing function comes from filling the cups with fine sand (clean and dry). The sand adds some weight to the feet, and effectively transforms the energy in the vibrations to heat thr