I tried this out for the first time on my Wilson. I don't know how others have found this but with vinyl tubing (water tubing) as a guide I got too much friction to easily pull filament from the spool mounted horizontally above the extruder. Maybe with Teflon tubing it would work, but I think a vertical or even a diagonal guide would work better than a horizontal one, it's simply asking too much for the filament to make a 90 degree turn on a dime from the spool down to the extruder. Probably would need a Teflon roller above a vertical guide (or a Teflon roller on the side of a horizontal one) for this to work right. I can hear my extruder strain to yank on the filament. The spool turns easy enough, it's the friction of the filament in the guide.