Spool Holder / Marble Machine
thingiverse
What's more entertaining than watching a printer print and just as practical as a marble machine? A combined spool holder/marble machine! This spool holder runs by using 6mm airsoft pellets that act like frictionless bearings for the marble machine. If you're ever bored while your printer prints, you can keep yourself amused watching your filament spool spin! The spool holder was made specifically for eight-inch diameter (average) reels of filament, three and a quarter inches or less in width. I just came up with a more sleek version that's a little smaller and uses even less material.
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