So I've just got a 3D resin printer, and I really want to try and make a dual density dildo using whatever method is most practical. Bearing in mind, I have never 3D printed anything bigger than my thumb, and never casted anything in silicone except for a clone-a-willy attempt.

At first I thought the simplest way would be to just print the dildo and core positives, make molds from them in algenate (like clone-a-willy), cast the core with silicone then combine the core into the outer larger algenate mold and finish by pouring the softer silicone around it. But it didn't take long to realise there would be major issues with that. Not least of which would be getting the 3D printed core and dildo out of the algenate, (core with the ridges and outer shell with the balls.)

So then I thought printing the mold would be the way to go. Every idea I had seemed to have some kind of flaw though, so I kept re-working it until I came up with this:

https://i.imgur.com/Z28dCEp.png
(I should clarify, the Step 1 is a two-part mold like Step 2. But I just got lazy go to back and redraw it as such)

I would absolutely love and appreciate any feedback from any experts as to whether I can expect this plan to work, and if there are any potential issues I should look out for before I commit to 3D printing anything? I do know that resin can prevent silicone from curing, so I will make attempts to mitigate that through long curing times and bees wax as a release agent.

Any other advice would be super appreciated! Thanks in advance

Edit: Also if anyone can help me figure out how to embed images in reddit that would be amazing too!