Ok I loved the original creepy crawlers toy as a kid. Spider was always a favorite. Now with the magic of 3d printing and oogoo I get to make creepy rubber spiders with my son! oogoo - http://www.instructables.com/id/How-To-Make-Your-Own-Sugru-Substitute/Not printed as yet , will update when printed.I print in ABS for the molds, I have not tested oogoo in PLA. I used a 10% infill and the finer a slice the better. Also i have found that acetone wash on the mold cavity makes a smooth surface which looks great on the castings.this is a open mold, pack and if desired use a wax paper to make a smooth flat bottom on the castingoogoo is silicone caulking (the cheap stuff that smells like vinegar) mixed with cornstarch.