"clunk" or "pop" after z axis retract


Since I received my form 2 (4mos ago) I’ve noticed and occasional clunking noise which I think is coming from the z axis. It happens after the peel and when the z axis reverses after retracting. It only happens every so often and hasn’t seemed to affect the print. But, yesterday I got the “motors jammed error” right at this spot. I hit continue and the printer restarted smoothly and the print finished with no evidence anything had happened. I applied some ptfe grease that came with my Ultimaker 3 to the lead screw and haven’t had it stop again, but it makes me nervous. Is this normal? This doesn’t seem like a time when there should be any violent motion. The part is already clear of the tank and hanging on the build platform. Any thoughts?


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