Z-Axis motor shutting off at beginning of prints?

[RecEcology]

Hello all,

Everything else seems to be in working order afaik except that the z-axis, after properly homing at the beginning of a build, drops away like the servo's shut off. Here's a video: https://www.youtube.com/watch?v=Xa1whH9yRVg.

Z-axis motor works fine for leveling the bed, etc. It just stops working when a print is attempted.

How can I address this?

M2 is upgraded to dual print heads, if that matters.

[insta]

Your endstop switch is plugged in backwards. When the switch clicks, it shorts out the 5V and GND rails and the whole machine reboots.

[RecEcology]

> Your endstop switch is plugged in backwards.

My goodness, could I really have been that dumb this long...? I went back and verified the z-endstop wiring, and found it can't match the kit assembly guide https://cdn.shopify.com/s/files/1/0030/ ... 7839233417. The wiring harness for it is listed as having its yellow wire to the rear. Mine has brown, orange and red wires, so it looks like I guessed the color mapping of the wires (incorrectly).

I rotated the harness 180 at the microcontroller end, re-plugged it into the Z-max socket as directed and am heating up for a trial run now. Any ideas why this one should plug into z-max when it's at the min end of the z-axis, and the other two end stops plug into the x-min and y-min sockets?

[insta]

Yours is homing upwards, so you still want Z_MIN.

Or, yours is looking for Z_MAX but the motor is spinning backwards. It depends on how the firmware is configured -- report back once it hits the switch a second time.

[RecEcology]

Looks like I needed to move the wiring harness from z-max to the z-min socket on the controller board. So I guess I have a different board than the one in the instructions. Those definitely say to plug into z-max. Motor is spinning the correct direction for sure. Thank you for your help!