Hi all! I have designed a custom tool head for my Lulzbot Taz 6 which allows it to use the Titan Aero extruder, including the new E3D Slimline Titan extruder (https://e3d-online.com/nema17-12-7n-cm-titan-slimline-stepper-motor-d-shaft). Everything works great...except that the stepper doesn't turn at all. It's like the printer is preventing a cold extrusion or something. I get nothing from the stepper motor at all. Am I missing something silly? Is there some sort of incompatibility with the E3D stepper and the Taz? I've gone over all of my wiring a couple of times, verified that the original steppers work fine, and even swapped out the E3D stepper with a spare one I had on hand with the exact same results. I'd love any ideas you all can throw out there. Thanks!