RegalPotoo ,
@RegalPotoo@lemmy.world avatar

Having tried similar things, I cannot stress enough how much you want to be printing molds like this in TPU unless you really really want your mold to be permanently embedded in the concrete

JustEnoughDucks ,
@JustEnoughDucks@feddit.nl avatar

You can also print the object and use it to make a silicone mold, right? That doesn't stick to concrete.

RegalPotoo ,
@RegalPotoo@lemmy.world avatar

True, but silicone is 10-20x the price of TPU

Mora ,

The advice on sex toys (not cement!) I've read suggests using beeswax. I wonder if this would work as well🤔

hooferboof ,

Pla and a heatgun works but its not ideal. Definitely takes a while to melt off from more complex geometries akd isnt reusable.

In theory ABS is acetone soluable but ive been having a hard time coming up with a usecase where acetone is preferable to anything else

roller ,

@RegalPotoo @Wilshire good point. Release agents are used for casting concrete. They look to be oil and water mix so I'm guessing most plastics would be compatible.
Also has to be a clear path out for the print/concrete.

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