4 DM542S 24-50v, 4A digital stepper drivers ($32 ea),
2 48V PSU’s (7.3 A each) ($23 ea)
1 Keyestudio GRBL board ($20) with GRBL 1.1f loaded.
3 [Nema 23 Bipolar 1.8deg 2.4Nm (340oz.in) 1.8A] (Yx2 and Zx1) ($25 ea)
1 stock stepper (on X - because I was short a pulley)
Total of: ~$255
(Steppers, Drives, Oh My! Adventures with replacement electronics and drives)
The keystudio board is…junk. Don’t use that.
I’ve since changes to a TR https://shop.tomsrobotics.com/product/grbl32-3-axis-cnc-controller-g32f13-150khz/ which is a little off the beaten path, but works great. It’s software port is far better than the supergerbil board and I’ve fed back a few changes to it.
1 48V PSU is sufficient. The current rating you need is (1.8*3 + the stock one) * .666 = about 6A.
The DM542S drivers are very, very quiet.