if you have the budget, go ACME and Nema 23.
I ran through pink insulation foam from home depot at 200 ipm on this without a bit of problems. Speed 1 on the dewalt with a 1/16" bit. I bet I could easily have run it faster.
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As an update, after finishing this project, I upgraded to nema 23s.
I bumped my voltage up on my potentiometers up to high values (2.4v on y axis, 1.7v on x/z) and attached these heatsinks to the gshield chips:
https://www.amazon.com/gp/product/B007XACV8O
Now I can run z at 1000mm/m max speed for as long as I want, and the y/x axis almost can’t be stopped by hand.
Here’s how the project came out:
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