Summary

Filament spool holder inspired by the Universal Filament Spool Holder by butchja.

My version

• fits into the original filament holder of the Anet A6 (and A8?) and
• can also be used without roller bearings.

The spool holder can handle spools with inner diameter from 28 to 60 mm and width from about 32 to 84 mm (at Ø72mm spool inner diameter).
You can use ball bearings DIN 625 - 608 (most common used skateboard bearings) or simply run it on the M8 threaded rod.