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I began assembling a M Prime One, and got to the point of adding the mechanics. I couldn’t find anywhere which pulley’s to get for the X and Y axis, apart from being GT2’s. How many teeth/pulley is the default for the firmware?
The default is 20-teeth pulleys for both axes. As you say, any kind of pulley can be used if you are willing to modify the firmware. You’d have to change the steps per mm, which can be calculated using the great and free Prusa Calculator: http://prusaprinters.org/calculator/#stepspermmbelt.