Plastic thread

I’m thinking of designing shoes or soft products using waste plastic. Has anyone ever tried or come across a project that turns waste plastic into thread? Could the extruder be used to create this?

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Welcome to Precious Plastic @vancodal
Trying to make a fine line of plastic thread with the extruder might not be possible. If you make a tiny hole in the extruder nozzle, the plastic won’t be able to exit the nozzle as fast as needed and lots of pressure will build up, which could end up damaging the worm gear of the motoreductor.
Adidas did something similar, but they have way more advanced tools and machines for that purpose:

https://www.wired.com/2016/06/adidass-newest-shoe-made-recycled-ocean-plastic/