After two sbase boards died within two whole weeks each of plugging them in I decided that it was time to give the genuine article a chance. I was pleased to see a QC sticker - it was nice to know someone had checked it out before I received it.
I changed a bunch of my connectors over, and wired it up. Motors ran in the right direction…the M119 command registered 0 for non-triggered and 1 for triggered endstops. Homing works correctly. The hotend (heater, fan, extruder) work correctly.
However, if I go to print using repetier or cura on windows first the machine homes (good) and then the machine tries to go lower on z (bad bad bad). I have a switch that I hit to prevent damage, but what could be going on? The Gcode has no such outlandish command in it.
Ideas or solutions? How does directional control on Z work and homing work and this not work?