this post was submitted on 10 Jun 2024
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This one combines with my suggestion, too. Lost PLA casting is a thing - you bed the print in sand or similar, add sprues, vents and feeders (and maybe some sort of extra drainage to be closed up after? I haven't looked too closely into it), and melt it out instead of having to manually take the mold apart and put it back together.
Then, you can have a cast in metal or glass without having to manually build the form, and without having to use a million mold pieces to achieve any kind of hollow geometry.