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 GuestMore detail.
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gr5 2,295
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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