These are parametric riser feet for a Makerbot Replicator 2. I don't know if they fit the other Replicator models, but they're parametric, so I'm sure you could make them fit.

Included are two STL files, one for 45mm height (as shown) and one for 25mm height.

I printed these in SUNLU/JAYO Silk TPU, though there are probably better materials than that. I used 1 perimeter, 10% lines infill, 0.2mm layer height, no rafts or brims. Printed at 235C on blue tape on an unheated bed.