The drive train has become locked. The driving wheels will only turn 1/3 revolution either way. Hmmm.
I’ve stripped it back to just the gears and the problem persisted, nothing obvious, so the free gear axle came off and the motor turns the worm wheel freely. Phew. I put the free gear axle back, and after an initial stutter, it appears to run well. I’ll do more testing and slowly add the centre axle with gears and wheels and see how it goes.
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