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Hi there !
There are some experiments with injection and wood moulds here: https://davehakkens.nl/community/forums/topic/portable-desktop-injection-machine/
Seeing those tests, I’d say using strong wood and foil tape should work reasonably well. I’ve never tested injection but here’s a write-up about my experiments with MDF wood and compression (it’s in french) : https://wiki.lghs.be/projets:recylab:compression:tuile-hexagone
So the 2.0 machine has the press inside, the 2.1 has it outside.
More info on this page: https://preciousplastic.com/en/videos/build/upgrades/compression2-1.html
With this upgrade the compression area (carjack) is shifted underneath the machine, this way the machine can run continuously. With this change you can now compress and cool one mould while you’re heating up a second one. Besides being more productive and efficient this upgrade makes the machine easier to build as you don’t need to install the compression mechanism inside the oven.