Yesterday I tried an experiment. I wanted to know if you could cast Silicone Caulk in 3d printed molds.
The answer? Yes! I used PLA for the mold, Petroleum Jelly as a mold release, and some Acrylic paint to color the part and provide the moisture required to set the silione.
Unfortunately I underfilled the mold so my part was unusable. It is still a resounding success though.
On to the pics!