The stepper motor driver upgrade was a spectacular failure. The printer made funny noises, the smoke came out, and it is dead.
The new stepper motors came with pin strips loose, which I neatly soldered on, and after installing, the electronics made funny, strained noises. Clicking the "Motors OFF" button quitened it down, but after the HOME command (G28) the noise would intermittently come back.
The mechanicals also started acting weird, during the re-calibration procedure.
Next, the smoke came out and the PC crashed (so much so that I needed to disconnect power and take out the laptop battery to get it to start up again). The Arduino Mega now does not speak to the PC at all (RAMPS unplugged). My Arduino Uno works, no problem.
So the controller at least is kaput, possibly more. Eish...
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