About the problem of the square spool holder of our Mini.
I share a remix of the original by Greg Grieves (ggrieves).
Fits perfectly on the Mini 2, and runs smoothly rolls of 1kg and 3kg.
I just extended it a little to cover all the spool holder, and I made a cap so that the spooler would not slip up.

3h 48m, using 5.64m to PLA.