Made this 3d printed mold of a Mandalorian bust that I then used Elmer's squishes silicone in. The Elmer's squishes are really soft and stretchy silicone. You can color it with a drop of acrylic paint. Make sure to use some sort of mold release. Joann Fabrics had a paint-on mold release in their vacuum forming section or buy the spray one from Amazon. Found the silicone mix in the Walmart craft section by the Stem stuff but could be used for any brand silicone casting material.
The author remixed this model.