A1 Mini Spool Lock

Simple spool lock for the A1 mini single spool holder

I've had some mixed feedback on whether it will work on the A1. Some have said it fits while some have said it does not. I do not personally have an A1 to try so I can not properly test. Print at risk for A1. 

I have had some bad luck with 3rd part filament getting stuck and being nearly pulled off the original spool holder. This can be an issue as I have my spool mounted above the print bed. Created this simple spool lock to better ensure the spool does not come off the spool holder.

Low friction slip on holder to minimize stress on the vertical spool mount.