Have upgraded K1 MaX and to be honest its been an unsettling journey , managed to get one multicolour benchy and ran a few longer single colour prints but then started to get various feed errors and latest situation is that the extruder isnt feeding as per video , extruder is clean and no blockages but just cnat seem to get it take the filament - have removed CFS from scenario as I believe thats ok but the errors are falsley stating its CFS but more likley an extruder or motor issue - video above is filament straight from spool and i can feel the extruder trying to grip but fails - or thats my assumption
I had a similar experience. But it turned out to be a broken wire, in my case the orange one, that allowed the motor to still vibrate like it was trying to grip the wire. Took ages to diagnose. A replacement Moons Motor and priblem resolved.