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Just a follow up, anyone else had problems with this?, I built it great for use on my fab mini, however I've had to failed prints because if it.
I came back to find the spool holder had been pulled right up to the Extruder at the side of the printer.

I tnink it's the feeder, I built the smaller one, but it doesn't seem to pull and turn very well, was wondering if the larger,longer feeder would work better.?
I've sanded in the tube,and the tracks, but nope , which is a real shame, this is perfect.
So anyone had similar ?, or any ideas?
I just need a good spool holder for large 1k spools?