Thanks for the response. I think those look good but don’t have enough juice for steppers I have. My steppers run at 4.2A at 1.6V:
https://cnc4you.co.uk/resources/Step...08%201.5Nm.pdf

Your point does open up the question of why I am looking for a routoutcnc driver specifically, and the answer is that I’m playing it safe because I have limited knowledge and limited cash to experiment with. I have a routoutcnc BoB and the routoutcnc drivers attach neatly with screw terminals to pins on the BoB, and I know that they will work together. However, the routoutcnc drivers are in fact underpowered for my new steppers and ideally I'd get beefier drivers.

If you or anyone else could help me understand whether I could use a different, more powerful and more mass-produced driver with my steppers and BoB I’d be very grateful.

This is the routoutcnc driver’s specs:
https://www.tiggyengineering.com/wp-...5ampdriver.pdf

Routoutcnc Breakout Board:
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Size:	2.20 MB 
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Routoutcnc driver:
Click image for larger version. 

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Size:	1.48 MB 
ID:	31879

As you can see the driver has 8 screw terminals that connect to the BoB:
GND, +VE, 1A, 1B, 2A, 2B, STEP, DIR, EN, GND

Ideally I’d use something like this, which is capable of 4A of current:
https://wiki.dfrobot.com/TB6600_Step...r_SKU__DRI0043

The TB6600 driver has screw terminals labeled:
VND, VCC, A+, A-, B+, B-, EN-, EN+, DIR-, DIR+, PUL-, PUL+

Could I wire the TB6600 to the routoutcnc BoB, even though the screw terminals are labeled differently, and the TB6600 has more of them?

Any help appreciated!