This spool holder accommodates a wide range of spool sizes (at least 160-200 mm, probably more) and prevents tangles caused by the filament jumping over the flanges of the spool. It uses ball bearings salvaged from hard disk drives. The rollers are tapered to keep the spool centered in the holder.
Former electrical engineer, I became a dentist in 2011. I designed and built my printer, Son of MegaMax, using surplus machine parts at the Milwaukee Makerspace.
My newest printer design, Ultra MegaMax Dominator, is a coreXY machine with a 300...