Drill bushing for filament spools

thingiverse

To fit third-party filament spools onto my Makerbot, I needed larger holes in their hubs. Using a 2" hole saw, I enlarged the spool holes. To ensure accurate drilling, I printed a bushing for the pilot drill that fits perfectly into the existing hub. For easy use on multiple spools, simply hot glue the bushing in place to prevent it from moving up the drill bit, and it can be reused by prying it out later.