3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
The r/functionalprint community is now located at: or [email protected]
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I've done traditional DIY mold casting using ProCreate putty and found it suitable, if that material is in your budget. I have used a little bit of mineral oil inside the mold as a release agent. For me the most success has come from letting the material sit in the mold two or three times longer than you think it should take to be fully dry.
Not american, so I don't know what would be a local alternative to procreate. Seems like epoxy putty? Wouldn't make much economic sense to me, those are more expensive than modelling clays and even more so than me recycling used paper and carboard into that thing.
Have you tried DAS clay? If you're British, you can buy it pretty cheap from The Works, Hobbycraft or The Range.
It seems like it'd be exactly the right consistency to fill out these molds - a smidge firmer than playdoh, but much softer than plasticine.
Edit: just remembered, you can even get stone effect DAS clay for the same price, so no painting needed!