iMetrx Nema 17 Stepper Motor 42x40mm Ender 3 Extruder Motor 1.5A-3.8V 2 phase 4 wires 1.8 degrees with 1Meter cable for 3D Printer Motors

Bought these to use with a 4:1 pulley for some moderately heavy Venetian blinds. Only gripe is that without idle hold enabled, then still turn when under load.

Extremely well built. Deserves an accolade

Put this on my ender 3 pro’s extruder as I upgraded to dual gear, really nice quality and i would probably buy a couple should i need them,

good motor

The media could not be loaded. Incredible, I replaced the X and Y motors of my Ender 3 Pro with 42-40 ones of this and I was able to increase the acceleration from the default 500 m/s2 to 5000 mm/s2, and probably can go higher with a little more voltage, but I'm quite happy with the current speed, with the input shaper and the linear advance features of Marlin, now the printer prints 2.5-3 times faster with higher quality. Though the top speed is still limited with 120 m/s as the hot end can only melt around 12-12.5 mm3/s of filament. The model in the video normally prints in 12-13 hours, I was able to complete it in 5 hours, unbelievable... I increased the default voltage from 580 mV to 850 mV and that's it. The original motors, especially the X motor was getting too hot, around 50 °C, even with an acceleration of 1000 m/s2 and the aforementioned 580 mV input voltage. The new ones never go over 30 °C. I'm super happy and planning to buy another 5 of these to replace the Z axis and my MMU2s motors. Oh, I didn't need to change my printer cables, these were a drop-in replacement, my board is an SKR 3 EZ.

My 42-34 X axis stepper motor would get to hot to touch, when doing a big print, due to my dual drive bowden extruder adding more weight.After fitting the 42-40 motor, the movement is a lot smother and the motor never gets hot.Very pleased with it and would recommend.

I was surprised by how quite these stepper were using a4988 motor drivers they don't sing like my other steppers.

Spot on