Stepper Motor Nema 17 Bipolar 40mm 64oz.in(45Ncm) 2A 4 Lead 3D Printer Hobby CNC

I bought this motor is replace the weak extruder motor on my Wanhao Duplicator i3 v2 that I recently changed to a RAMPS 1.4 board. I've been using it all weekend, and so far everything is working out pretty good. I haven't gotten around to reinstalling my Flexion extruder kit back on after changing back to the stock block with the all-metal upgrades, but this thing can definitely power that. Not that noisy (although nothing is that noisy when sitting next to the fans that came on the Wanhao), and haven't had any clogs or skipped steps yet. I know the stock motor is 34mm, but a 6mm difference is negligible for me, and the tradeoff in torque gain was worth it. One note though, I had to remove some metal from the heatsink to make it fit, since the shaft is a bit longer than stock as well. Also, be sure to adjust your voltage, because the stock motors run at a pretty significantly lower voltage than these.

Great stepper for the RoBo 3D I built a clone and these motors work great with the RAMPS and default drivers. The wires are plenty long enough, and although I would have loved a connector at the motor itself, I can always add one myself. No issues with drift or double-stepping. Plenty strong enough for all 5 motors of my machine.

Nothing I can complain about. I just wished I purchased something more powerful for my application. I beat up this motor, held it still while trying step, and turning it while it was trying to hold, but no complaints per the motor. I got it stupid hot in an attempt to really work it, and it still responds quite well. So I only have good recommendations for this motor. (I'm going to order the 84oz motors for my application, and use the same seller :D )

Worknet for about 3 hours and then it started skipping every once in awhile and still doing it

So far it's a good little motor, however the low 1.1ohm coil resistance is causing me some issues with one of the L298N H-bridge modules I also bought off amazon. In order to drive this motor you either need a current limited power supply <2A or you need to drive it at about 2V. If you supply it with 12V as stated in the spec sheet, it will draw about 11A, which is plenty to smoke-check both the motor and your H-Bridge. If you're going to use this with the L298N, you must use PWM, or wire 4-8ohm@5W resistors. If you don't know what any of this means, don't use it with the L298N modules you will end up smoke checking the motor or the bridge.