Yep I am a fan of solo cups! Cheap, get 2-3 starts out of one. I have been popping holes in the bottom with a 1/4" bit, just stack and you can do about 10 in one go.

No pots, etc. can compete on cost with a jumbo pack of party cups from Costco.

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I’m working on 3d printing airpots. It’s been a little more complicated then I thought. Check out Tinkercad online. Pretty good site to design 3d models.