This board is a bit misleading because I am using the wrong connectors to mock up an early 3D. The actual connectors are right angle and a bit wider, but testing on a paper print it seems that I have just about the size I need. Below is a picture of the Stepper Motor this targets.
These Steppers cost ca 1.- USD and they took me completely by surprise. As I started one of them it was moving slow, smooth and absolutely soundless far more powerfully than I expected. You get a lot for 1.- USD on these to be honest.