Editing Step 12 —

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You can now connect your electronics to the stepper motor.

To ensure the construction is properly aligned and straight:

Loosen the bolts on the idler end and motor end slightly.

Slide the syringe carriage along the rods to align them, and then tighten the bolts one by one, sliding the syringe carriage back and forth to check alignment. (thanks to Ceri Clatworthy for the tip!)

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