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MM3 1/2" mechanical drive question

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BigFloppy

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I have a spare Nema-17 stepper motor from a previous project... these things have some serious torque behind them but I'm mechanically challenged

Anyone know what size coupler I should get to plug the stepper to the MM3 1/2" drive ?

Will the 5x12mm coupler work or do I need to go 5x14mm?
 

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