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This Nema 17 size stepper motor is equipped with MG series high precision gearbox. The gear ratio is 5:1 and the Max. backlash is 30 arc minutes. It's an excellent choice for applications that require good accuracy but low cost.
As MG series gearbox built-in shaft coupling, so you can change the motor or gearbox easily.

STEPPERONLINE 1-5PCS Nema 17 Stepper Motor 60oz.in 38mm 1.5A for DIY 3D Printer
$35.99
NEMA17 Stepper Motor 42x34mm, 1.8°, IP56, New - Selling in Lots of 10
$38.00
Nema 17 Geared Stepper Motor w/Ratio 5:1 Planetary Gearbox L=40mm 1.58A Φ8mm
$41.46
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