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Stepper motors are usually pretty cheap and easy to trade out. Looked at the replacement pricing - crazy! There should be some labelling on the existing motors.
Steps/degree (I assume 1.8, but could be 0.9)
Motor size (looks like Nema 17)
Torque rating
Max current
Unipolar / Bipolar motor
Look at stepperonline.com / Ebay for motors of equivalent specs.
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