How to stop filament from tangling when it unspools?
My Atom2 delta-style printer works fine, but any time I make a print that takes more than about 40 minutes the filament gets tangled between the spool and the printer. If I don't untangle it by hand - which can be tricky and take a while - the extruder get stuck and the print is ruined.
I've tried having the filament spool both horizontal and vertical, on the table with the printer, and on the floor, and none of these options seems any better.
Am I missing some secret about unspooling filament in a way that does not cause tangles?