A filament spool holder where the spool is placed at the top edge of the printer.
The filament is turned 180° so that it can be fed from below into the extruder (which is at its standard installation location).
Only the metal ball has to be unscrewed from the filament sensor, with which it is otherwise attached to the magnet.
When changing filaments, it is first fed (through the sensor) directly into the extruder and then threaded into the deflection device in the second step.
3x 608 ball bearing
350mm of an 8mm aluminum rod
1x screw M4x16 + self locking nut