Second attempt at a custom wax stamp, and second failure – though there is notable improvement. With a much more robust handle and base, the PLA did not warp and melt this time, which is an improvement. And with some internet suggestions of oiling the surface, the wax did not stick as much. However, the oil apparently was only on the surface, so once the wax entered the pattern itself, it locked itself in immediately. This of course then destroyed the impression (and the stamp).
Going to reprint the stamp, and then try brushing oil on the surface (instead of stamping onto an oiled paper towel). Assuming I can get complete coverage, I expect this will be a workable solution.
