This mold will help you to build a nice masturbator, shaped as almost anatomic asshole. You will need soft silicone/rubber with very low adhesion to your mold material, and able to stretch at least for 200%. It can be printed without supports. Also, you will need 6pcs M3x50 screws, 8pcs M3x15 screws and 14pcs M3 nuts to assemble the mold.
Working length is 180mm. Mold outer diameter 120mm.