I ordered two of these to replace my Z motors on the RepRapGuru I3 machine. Only one motor was defective but I figured it would be best to replace them as a matched pair, with the good one being reserved for backup replacements in the event of other failures. They were stock replacements for standard engines. However, this item has a higher amperage rating and slightly higher torque, so I can underestimate it a bit and not lose anything in trading.
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