Thing-O-Matic Filament Spool Bracket

thingiverse

This spool holder design, despite its similarity to others, doesn't require a filament guide. It works well on both the printer itself or your workbench. To assemble, first print out the parts which are already pre-mirrored. Then, cut three different lengths of 3/8-inch dowels: two at 112mm, two at 134mm, and one at 114mm. If necessary, drill these holes to fit the dowels snugly. Assemble as shown and if the dowels are loose, secure them with screws in pilot holes. Trim or sand for a perfect fit on your printer. Next, drill small bolt or rod holes into each 114mm axle end to keep the top brackets stationary while preventing the axle from spinning freely. Ensure this is loose enough for easy spool replacement. Also, drill out or trim bushings for a tight fit on the axle. Position these bushing on the axle as displayed in the design, with the inner ones (use two or four) providing slight friction to prevent unwinding and outer ones centering the spool, noting that MakerBot brand spools have asymmetric spindle holes.