Made from Ninjaflex or any other flexible material, these are anti-vibration dampers designed to slip into the 40x40 profile underneath the Felix. My original foot pads that that came with the felix came off long ago and have since been sitting on some rubber mat so I designed these to be small and unobtrusive
Change your infill to suit how hard or soft you want the dampening, photos show one printed @ 25%
http://www.thingiverse.com/thing:700228