Small core spool holder

30mm shaft spool holder out of cheap cord reel. I have been using this original design for quite some time for my larger spools but recently purchases some filament from http://shop.printbl.com/products/3mm-pla-filament-1kg-spool and it comes on a whack small core spool and wouldn't fit at all so I sketched this up from Mike Queally's original design and it works excellent.