I printed these in 3DXTech flexible TPU, although most any TPU should work. There are two STL files for this foot. One is a reasonably accurate representation of the original foot, accounting for rubber shrinkage, and one is an easy-print version without the sharp overhang. I am only capable of printing the easy-print version but have included both for completeness. Print at a slow speed. The narrow stem neck and the limited cooldown result in this tending to be a very blobby print. You may need to do some trimming of the stem to get it to properly attach. When attaching it to the typewriter, you will need to kind of screw it in to get the foot to properly seat flush with the sheet metal.