Spool Extender Clip
thingiverse
I have my spool mounted flat, and had some trouble with the filament slipping off the spool. I used binder clips to extend the bottom part of the spool, and while that solved one problem, it created others (like the filament getting caught on the binder clip). This spool clip keeps the filament from slipping off the spool, and won't inadvertently catch on the filament while the spool is turning. It's fully customizable. See the 4th photo if you're having trouble figuring out what parameter means what. Instructions Print 3 or 4 clips and attach to the bottom part of your spool.
With this file you will be able to print Spool Extender 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 Spool Extender Clip.