I made these replacement horses for http://www.thingiverse.com/thing:33387The dimensions are generally the same as the existing ones so that they don't interfere with each other, just not as thick.Replicator 2, MakerWare, Miracle Grue medium settings added http://www.thingiverse.com/thing:38272 to the ends to reduce curling (really helps) 20%infill, 2 shells .20 layer thickness default temp and speed (230C and 80mm/s)I printed two at a time to save time in case both turned out well, but not more than two in case something failed and would waste the whole thing.