Melt it low temp into some sort of bowl mould.
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Ok, I melted it down and have about 70 bowls. Now what?
Give to a friend / colleague, then make a pen holders, etc.
Then, up your prep/calibration time to reduce wastage.
Perhaps not helpful for most people, but Add:North offers recycling for PLA which you have bought from them.
You can look here might find a place near you that takes plastic https://community.preciousplastic.com/map I've been looking at getting something like this to recycle my own filament. https://felfil.com/?v=5ea34fa833a1
I haven't looked into it too much or done it myself, but I heard of https://creativeheartwarrior.com/pages/filament-recycling
Looks like they currently only take filament as a donation and not as an exchange.
Edit: also found https://printeriordesigns.com/pages/recycling
(Again, haven't personally tried)
You should probably look into if there's a company doing this local to you. Either way, I'm very interested in this too.