Unfortunately...it is not working! The stepper motor runs but the lasers are not firing. Here is the stepper motor doing its thing at the command of the RPi:
I finally assembled a cut down version of the circuit so that I could more easily work with just the problem bits, and even more importantly, so I could get some help from the SoliForum.
I had been told that the laser does not get connected to ground at least once before I finally decided to listen! In any case it now works.
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