Summary

These are simple feet cups that can attach to any printer with 40mm vslot bottom rails. Designed to mount with two m4 screws and t-nuts.

The cup is designed to fit an ~38-40mm diameter squishy balls. This is a cheaper alternative to a 40mm squash ball. In this case I used soft but firm squishy cat toys and they appear to work very well. Any ball with decent give should squish into the feet cups just fine.