Sprung feet

Because these printers (Dremel3D20) are heavy 7-8Kg with servo's playing discordant noise through feet, table floor and sometimes quiet regions of the house, I needed a damper/isolator. I tried http://www.thingiverse.com/thing:615325 but of course these were too weak to cope with the mass. I saw http://www.thingiverse.com/thing:213696 which gave me more ideas. This is split in two parts, feet inserts and damper rings.