Spool holder on 608 bearings

Description

The roller turns on two 608 bearings, the same ones in skateboards and old printers. The spool pays out smoothly and stops tugging the extruder, which you can hear on a long print: the clicking goes away.

The frames print separately and stand at any spacing up to 100 mm. The roller is longer than most spools need; the excess simply sticks out. For 750 g spools set the frames 70 mm apart.

The cradle is a half round, so the roller lifts straight out and a spool change needs no disassembly. Nothing to glue - it holds by weight.