Should have used some kind of mold release.
Doesn't matter now, I cleaned it up, greased the mold with silicone grease and cast some more plaster!

And now it doesn't want to come out at all, lol.
Time to go one step deeper and make a silicone mold!

Now I'll print a mold in which I'll cast silicone to make a mold in which I'll cast plaster to make a mold in which I'll cast... man this is getting a lot

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@gigabecquerel Not glass, right? What material is that?

@niplav Oh yes, glass!
It's uranium glass which I ground up, filled in a mold and heated until molten.
gigabecquerel.wordpress.com/20

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