One of my extruders (the one I haven't been using, of course) has a problem: it stalls while extruding.
I'm able to push the filament through with light force while the lever isn't locked - so the head is clear. And while the lever isn't locked, the gear turns just fine. But once the lever is locked, the motor starts making clicking noises and not moving though part of the revolution (while working fine, and sounding just like the other extruder, through part as well). Once it stops though, it won't start tuning again until I unlock the lever and let it turn about 1/4 rotation.
Yes, I checked the lock screw: it's tight. Yes, I've cleaned out all debris from the drive gear. Yes, I've turned the current up to max on that extruder (turn clockwise any farther, and it won't run at all). Increasing the current helped, but it still stalls at some point.
Now I'm stuck: is the problem with the driver, the motor, the gear reduction, or something else I'm not thinking of?