Back stop for CraftBot

When using the filament holder on the CraftBot (I have an XL) the spool can move back and forth and the filament may unwind and wind around the spool holder. If that happens the filament can get stuck and the print aborts.

The back stop clip fits the filament holder and prevents the spool from moving on the holder rod.

See pictures for illustration of the problem and the solution.

No need to print in high quality - after attaching you will only see it when you change the spool :-)