Filament clip
thingiverse
I made some changes to Madox's nice 1.75 filament clip (http://www.thingiverse.com/thing:12516). The only thing I did was enlarge the hole from 2 mm to 2.5 mm. Edit January 24th: I also added a new clip with a 2.25 mm hole.
Download Model from thingiverse
With this file you will be able to print Filament clip with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Filament clip.