Gabriel, Thanks for your question. Just to make sure that we are on the same page, Nema 17 and 23 refers to size of the front plate of the motor. You can use Nema 17 motors, but you will have to modify the source file, specifically the shoulder, with a CAD program, like Autodesk Inventor. In practice this shouldn't be very difficult because you will just have to downsize the motor cutout. However, you will need a pretty strong Nema17 motor, but make sure you do not exceed the current capacity of your stepper drivers. Let me know if this helped. I would be happy to clarify or answer more questions.
Dr. D-flo, I am a college student from China. I really admire you and like this 3D printing arm you made. And I learned about the Moves through this arm.Do you have any information about the CAD files format of this mechanical arm?I would appreciate it if you could give me some help!