I have a design that will involve a great many identical parts. It would cost quite a lot to print them with shapeways, so I'm going to cast them. What plastic should I use if thin (0.7mm) walls and stalks are involved? I'm not using a soft silicone rubber mold, so the accuracy of the mold is not an issue. I know someone who can machine it in steel, but is there a release agent for plastic resin in a steel mold?
Forget about thicknesses like 0.7mm, you can't get anywhere near that if you are using regular "at home" techniques.