This is my version of http://www.thingiverse.com/thing:57650
I liked the idea but I found it to much trouble to source 8 screws for something basic as replacement feet. Second, I had 40mm round felt pads already lying around at home so why not use them.
If you print this, please click the "I made one" on this thingiverse page.
I printed this:
Layer Height: 0.25mm
Travel feedrate: 150
Print four of these. Stick the 40mm round felt pads on them and put them on your makerbot replicator 2.