Prusa Mendel I2 Foot for Spring Feet

I designed this to allow my printer to sway and vibrate uninhibited which allows for finer prints and less noise while printing. This also keeps accidental "bumps" from interrupting prints Sometimes. I also added wide base feet for tip protection while sliding printer around. ReprapFootWideBaseShallowHole.stl is designed to help level machine. It is 4mm less deep.