I ran across this interesting website https://preciousplastic.com/en/machines/ about making your own plastic recycling machines such as an extruder, shredder, injection molder, and an oven/press for molding blocks all made of recycled materials. The machines are all open source and blueprints are downloadable. More info here for the machines. Precious Plastic I would love to try injection molding and may build this one.
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It made me think of what Serge was doing with the HDPE awhile back. How to recycle HDPE (bottles, caps, etc.) into sheets / blocks to CNC