MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

Download Now

Report as inappropriate

There are three things that will influence the motor movement. And once you will set everything for 28BYJ-48 it is not so easy to put there NEMA 17 a run.
1, reference voltage on driver - for 28BYJ-48 I think you can safely use 0.09A to 0.15A per one motor (0.18-0.3A in Z axis). That is Vref 0.07-0.12V with common A4988 or 0.045V-0.075V with DRV8522. Nema17 needs roughly ten times more.
2, movement speed - for 28BYJ-48 inToyREP is safe to go 12.5, 12.5, 0.2, 1.37 mm/s in X, Y, Z and E. Everything above is matter of tweaking and testing
3, acceleration and jerk - start with someting acound {300, 300, 1, 17}, and jerk 5, 5, 0.01 and 0.1 for X, Y, Z and E. You can change theese once your motors are working. This is again totaly different from numbers ysed for NEMA 17.

Now, if your motors are chopping and changing directions randomly, there is either problem with wireing coils of the motor, pin connector or reference voltage. If they will try to move, but stall, it is probably problem of speed or acceleration and jerk.

Mine 28BYJ-48 after the bipolar hack have this order in header pin: Blue, Yellow, Pink, Orange. Blue-yellow is one coil, pink-orange is the second one and you will either detect short or measure same resistance with multimeter on each coil. There must not be any short between the coils otherwise the hack is not done properly.