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!

> 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/1/0030/7372/files/KitAssemblyGuideLow.pdf?10564411237839233417 ...

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 stop...