Ender 3 large spool adapter

thingiverse

This is a basic design for a large spool adapter suitable for the Ender 3, and likely other models as well. A minimal amount of filament is required, yet the results are still excellent. The wheel at the far end of the spool holder sits slightly higher than the one closest to the main structure, preventing the spool from rolling off unexpectedly. I utilized bike spokes with a diameter of 2 mm for this design, but alternatives can be used if needed. The holes in the adapter measure 2 mm in diameter, which results in a narrower overall size after printing. However, this was intentional - I drill them out to a snug fit using a 2 mm drill bit. Similarly, the wheels are drilled with a 2 mm drill bit and then carefully wiggled slightly to ensure smooth rotation without jamming. The two rings that secure the shaft in place are held fast by regular rubber bands wound several times up and down for added stability.