Easy print roller with additional groove

This is a remix of https://www.thingiverse.com/thing:3020026
With an idea taken from https://www.thingiverse.com/thing:3961520 for better printability.

I hat the problem that my spool moved always to the end of the holder giving an awkward angle for the filament and I always feared that the spool will hop down the holder. Therefore I added a groove.

The pin fits quite loose and could be fixed with a little bit of glue.

I added the freecad file if maybe someone wants to change it.