Unfortunately it was hard into one end of the Z carriage and broke off the opto flag. Yay! :S
Something weird is going on between the firmware and the host software - with the firmware in test mode I can get it to move both directions no problem, but when I'm using the firmware proper things only move one way.
I also discovered that passive cooling isn't sufficient for the stepper drivers; when the chip gets hot enough it starts sending spurious steps to the motor. Blowing on it was enough to get it to stop. I repurposed the extruder fan as a driver cooling fan, only to have the sinking realisation that Buzz nicked the molex connector off the end a while back... so I had to find another one to replace it. *sigh*
Off camping for a few days, so no progress until early next week. Cya!
Edit: just figured out my movement problem - it's what will happen if the endstop is being read with the wrong sense. Now I won't be obsessing over it all weekend!
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