Filament Spool Clip

When stacking the spools i got a big mess because the filament never stayed on the spool and unwinded itself. The holes on the spools are most times not enogh, on the wrong place and when you use them the filament sticks out on one side.

To store the spools better and have less knots and problems with the filament, i designed this little helper.
There are three versions for the three diffrent types of spools i encountered. 2.85mm and 3mm filement stays in fine, for 1.75mm filament you need a good printing quality.

If you have any idea to improve it please tell me.
Else Enjoy, comment and share :-)