Motor used?

Does anyone know what stepper motor is used in the EAF? Is it a 28BYj-48 or NEMA 17?

5 wires: unipolar, 4 wires: bi-polar. Nema 17 is a format specification not a stepper specification.

If it's 42x42 then yes but that still doesn't say what THAT Nema 17 motor specification are like. Although if it fits most likely any NEMA 17 with adequate torque will work.

Got it, the NEMA 17 spec. just refers to the bolt spacing in the front plate, the size of the front of the housing, length can be whatever is needed for the motor specifications.

Quick Google image serach for "zwo eaf teardown" found several images where the motor is visible.
For example this forum post:
https://forum.astronomie.de/threads/zwo-eaf-klackert-und-rattert.357690/
shows the motor name quite clearly - looks like "35BY48"
Of course it is quite possible that ZWO has used several motors in different incarnations of their EAF product.

Ok, so it's mounting class 48, interesting that it's geared down.

Have to say I rather agree with this comment:

"I'm laughing my head off! I buy these motors with a slightly higher gear ratio for around €10 for two. Add the Arduino clone for another €4,
add the 3D-printed housing, and I have the focuser for under €10."

There is a whole opensource project doing just that (with ASCOM/INDI drivers, supporting apps, extensive documentation etc.):
https://sourceforge.net/projects/arduinoascomfocuserpro2diy/

EDIT: forgot to mention that the popular extremely cheap Gemini focuser is just a ripoff of that project.

Thanks, that will be a great resource. I'm not looking to make focuser but I am interested in making other devices that I can control via ASCOM.

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