Magnetic Filament Clip for 8x3 round magnets

thingiverse

You grabbed a pack of 8x3mm round magnets for your extruder visualizer but only used one or two. This is an easy filament clip that uses two 8x3mm round magnets to keep the end of your 1.75mm filament stuck to the side of the spool. You might need a drop of superglue to secure the magnet in place. It may not work with certain spools, especially new ones that don't have much space on the side of the spool.