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After more than a year, the feet are still mounted under my printer and seem to be working ok. They have become noticeably stiffer, though. I guess one should try to minimize the starch content when making the ogoo. In my experience, the ogoo cures quite quickly even with a low starch content (1 tblspoon for a plastic cup of silicone caulk) - at least if it is mixed thoroughly.
Anyways, I have kept the mold for the feet around and whenever I had excess ogoo from other experiments (like http://www.thingiverse.com/thing:313006 ), I used it to more feet. Therefore, I have now several years of supply of these feet in many different colors now..