First run for my printer, anyway: :)
Just got the CoreXY mechanism working. This is just the right motor, but I also checked the left motor and it moved the carriage the other way. I think I’ll need to put endstops on the rods to constrain motion so that (for instance) the hotend doesn’t slam into the motors; that should be a fairly simple design. (I’m thinking printed rings clamped to the rods with screws, as I plan on using stall detection in the TMC2130 drivers in place of endstop switches on X and Y.)
Right now, I’m driving one motor at a time with a DRV8825 stepstick and a Teensy 2.0 on a breadboard. Maybe it’s time to finish wiring the electronics.