ams ht was designed very poorly, but if you met self tangling/strands buried into spool, it’s probably because the spool was too loose
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I ran into this same tangling issue with the AMS 2 Pro. It’s not caused by the AMS, but as you mention, a spool that is wound to loose. Already during loading (when measuring the amount of filament left on the spool) it started pulling the filament in on the flank of the spool. In my case it was a refill of bronze colored PLA basic. It basically only happens when retracting the filament.
I might have to rewind the roll to get the proper tightness on the roll.