I broke several screw type car jacks while making sheets.
So I upgraded the frame to a 3 ton bag jack.
Excuse the prototype it looks horrible, needs better linear guides, and a bigger frame/bed
I got about 60usd of steel and a half kilo of weld rod to try it.
I will put cooling fins on the top and bottom of the mold sheet and a couple cooling fans. I think active cooling while under compression will speed up the process.
I am currently extruding HDPE into a heated cook pot which keeps it molten until enough is extruded to use.
here is the video of my ugly prototype crushing some cans.