Which NEMA 17 Stepper Motor for Titan?

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Which NEMA 17 Stepper Motor for Titan? 

The safest thing to do is to wait a month (it probably won't take that long anyway), and order the correct stepper motor from China, or pay more and locally source the 42BYGHW609. The 42BYGHW609 is a commonly used stepper and it is best to keep all of the steppers matched - just for ease of calibration, matched performance/behaviour, and future maintainability. Otherwise you need to match (at least) the torque, the inductance, the rated current and resistance of the coils, if not the physical size and the stepping angle. Which is not an impossible task, but a bit of a pain, TBH. The time that you spend verifying the various steppers and then re-checking and worrying would be better spent ordering the correct one in the first place and waiting for it to arrive. BTW, take a look at the RepRapWiki - Nema 17 page which lists suitable stepper motors. As an aside, if this is your first purchase from China and are worried about reliability of service, then don't. I order everything from China, and haven't had a problem. In addition, if you order via eBay/PayPal you are financially protected if your order doesn't arrive (which does sometimes happen), or, alternatively, order from AliExpress, where I have never had something not arrive (if that makes sense) I have just realised that you need an extruder replacement (and not a X/Y/Z stepper)... in which case, as towe states, either of your candidates is probably fine, although maybe over-torqued (slightly). However, I, personally, would still replace the stepper with the same model that the 3D printer originally came with, but that is just my personal preference - unless you had found the 42BYGHW609 to be not strong enough, and you actually want to up the torque..?

 

Cloudray Stepper Motor Series has set the standard for quality, reliability, and durability in stepping motors. The precision of our Torque Power motors is matched only by the dependability of their performance. All Torque Power motors are bi-directional and totally enclosed with permanently lubricated ball bearings for long-lasting, smooth operation.

High Torque, High Precision and Long life is Cloudray's core advantages

 

                       Low vibration,Low heating, No loss of stepFast Response,
                                   Better Acceleration Performance.
   Thanks to a robust design they can be selected for the harshest environments. Precise, open-loop, speed and position control can be achieved with the application of full step, half step, or microstepping electronics.
                 Higher Resolution,Avoidance of Resonance Regions
Stepping angle is adjustable( rang in 18°±5%), 0.9 °stepper motor's stepping angle is smaller, fineness is higher and positioning is more accurate.Avoiding vibration,runs more smoothly and gets lower noise.

                            Sturdy structure, extremely long life
      High quality materials including bearings and shaft made in Japan
Robust assembly, high speed range, and exceptional performance in even the harshest environments make Cloudray Stepper Motors the perfect solution for demanding positioning applications.
Short length and light weight allow them to be used in highly integrated systems.

                                    

 Cloudray stepper motor factory video

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