Coupling for GREG spool for wide bobbin

thingiverse

I added an extra part for the GREG filament manufacturer's spool in St.Petersburg, Russia, which is available at http://www.thingiverse.com/thing:3588186. I needed it because I bought a filament bobbin with a different production spool that was wider than what I wanted. This addition adds approximately 13 mm to the original width of about 22 mm without any additional refinement of the original spool. If you modify the original spool, you can reduce the minimum width even further.