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[ABearden]

They've made a foundry and tried out some lost-PLA casting. It was a neat project and there were a few people involved so you should be able to get input.

That's interesting. Did the PLA disintegrate completely? I've seen people use foam in that manner.
I've been watching a lot of videos on a youtube channel, "myfordboy". He prints in PLA and smooths the part before using it the make the green sand mold.

I think they got it to eventually. Seemed to be a matter of building the mold properly so any leftover slag floated to the top. If I remember correctly, they did both plaster and green sand.