Hey all, The background is I have an Ox modified to run leadscrews that's been running ok on a TinyG board for a couple years. I decided to go to external steppers (TB6600's from Sainsmart) and an Arduino Nano (clone) running GRBL 1.1F because I've got some high-torque 425 oz.in. Nema 23's from Longs Motors on it. I'm also trying to get away from Chilipeppr as it's just not commonly used any more. I'm using Openbuilds Control, it connects fine and I've got the X and Y directions reversed so that it jogs in all the correct directions (including Z). I've connected my NC homing switches which are in Zmax, Xmin and Ymin locations on my machine. When I try to home all, the Z goes in the wrong direction (into the spoilboard instead of up to top of travel). Behavior is the same using UGS. I've tried reversing the Z-home location setting with the same results. I'd almost think that it would be a problem with the Z Direction wire to the driver except that it jogs up and down correctly. Any suggestions as to a setting or wire connection where I should be looking? @Metalguru I hope you don't mind me tagging you but I believe you run the same drivers and board.