Had a post a while back with a link to a Garage Journal forum thread where a guy did some great tool organization by milling HDPE blocks. Some info on DIY HDPE blocks.

And machines for working with plastic (shredding, extruding, casting, etc.).

Also read some things about using HDPE as a filament for 3D printing.  Not as easy as PLA or ABS, but sounds like it is do-able.

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