Spool Holder / Marble Machine

What is more fun than a spool holder and more useful than a marble machine? A spool holder/marble machine! This extruder-driven marble machine uses 6mm airsoft pellets as recirculating bearing balls for a friction-free spool holder. When you get tired of watching your printer print, you can now keep yourself entertained by watching your filament spool turn! Designed for 8" diameter (nominal) spools, 3 1/4" wide or less.New: I've just added a "slim" version that is more stylish and use a little less filament.Watch it go: Print SettingsPrinter Brand:MakerGearPrinter: M2Rafts:NoSupports: NoResolution:0.2mmInfill: 10%Notes:Print one left-side, one right-side and two screws. The screws print on end, so add a brim to keep them from coming loose while you print. The "slim" version of the right and left sides are functionally identical to the original versions, but they use a little less filament and print a little more quickly.Post-PrintingPress the left and right sides together over the two