Don't throw away your empty 3D printing filament spools—here's 7 ways to repurpose them

Some filament manufacturers sell refills that don’t include a spool but instead wind the filament around a cardboard insert ...
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Bambu Lab H2C

Bambu Lab knows you should ideally feed TPU in from the top (so why the back port?) and directs you to a top-mounted spool rack, designed and ready to print, on its Wiki. The same Wiki explains that ...