Here I have a professionally made mold that will produce a 6" x 2" section of wall. This mold has never been used, not even once. I am moving and never got around to using it. It is made of polyurethane and will make thousands of good parts. Very strong, meant to be used in a press with a pressure pot. Any material/foam/resin that is OK to use with silicone will work. Silicone recommended as a release.
You can see the detail of the part the mold was made of. I carved that wall section by hand, cracks and all
I am asking $200 shipped in the USA, Paypal only.