Yeah I mentioned it's a UM2 in the topic, but didn't in the post.
I will try lowering the power. I'm familiar with Mxxx codes (I also have a Printrbot Simple Metal, an M500 + M501 is practically a daily operation for using it!), so I'll do that. I wasn't keeping track, but from memory, it would make sense that it is overheating. The prints I recall them failing on were fairly long (3+ hour) prints. There was also a bit of clicking, which initially I associated with the extruder, but never made much sense since the print wouldn't have issues. Might have been the z-stepper losing power for a brief moment!
BTW, M500 = save, M501 = recall saved settings (to confirm they saved correctly).Edited by Guest
There's several possibilities. For example maybe it stopped extruding for 20 minutes and started back up. Much more likely though the Z axis slid down. You don't say which printer but the metal beds on the UMO+ and UM2 and UM2ext are quite heavy and if the Z stepper loses power it's common for the bed to slide down a bit and the stepper driver will cut power if it gets too hot. This has been a problem for many people with boards made in the last year and the solution is to lower the Z stepper current down to 1000ma. You should be able to set it from the front panel but will lose the setting on power cycle unless you save with I believe an M500. Try it first and if this fixes the problem ask how to save the setting permanently.
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