*sigh*
One problem with the print-a-part parts, they will not vulcanize well with low temp vulcanizing silicones. You'll need to make a resin copy. I found this out the hard way. I am currently investigating another technology that hopefully will.
You might be able to get a good mold using vulcanizing silicone if you boil the part first. They contain residual wax support inside the model in fine capillary channels. The model will get soft, but if you let it cool undisturbed, it will resume its original shape w/o shrinking.
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