I like the idea of reusable spools, but unfortunately every engineering material, CF filled filament, support filament, etc. comes with its own spool. I have bought the basic PLA without the spool, but that is the material I use the least.
So I already have collected more than 10 empty spools just laying around, wasting space. I am about to throw them away if I can not find any practical use for them.
Any ideas what to do with them? Do you throw them away?