The extraordinary extruder

Preamble

Following on from Kossel 3D Printer, and the tutorial videos (see Kossel construction videos) the BuildA3DPrinter kit comes with an extruder stepper motor with a planetary gearbox. This results in a very high torque. However, as stated below, it has been replaced by the 3325_0, a motor with the same NEMA size and same torque.

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Extruder stepper issues

Preamble

I provided an answer on Stack Exchange 3D Printing site, to a question relating to an extruder stepper not operating correctly, Extruder stepper motor problem, what can be wrong?

I have replicated the question and answer below.

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