Magnetic 3d printer filament spool holder

You can attach this holders on any steel desks. :)


Parts list,

1. M4 bolt(length 12mm) x 2
2. M4 nut x 2
3. bearing (thickness 5mm / inner hole 4mm / outer 16mm) x 2
4. magnet (25mm x 10mm x 1.5mm) x 2