[sblack]

I would like to mount an Avid Pro cnc router vertically to the wall to save space. Anyone see any reason why this would be a problem? Perhaps I would need to go with larger steppers on the Y axis?

[ger21]

It should work fine, but the axis that moves vertically will definitely move slower, or at least accelerate slower. A bigger stepper may or may not help, as bigger motors tend to have even less power at higher speeds.
Mounting work to the table can be tricky, as you're always fighting gravity.

[subnoize]

I would like to mount an Avid Pro cnc router vertically to the wall to save space. Anyone see any reason why this would be a problem? Perhaps I would need to go with larger steppers on the Y axis?

I wouldn't do it. The reason is the rack and pinion system. If it was ball screw or motorcycle chain, sure. But this is rack and pinion and even flat I can push it out of square without much effort.

[Mavigogun]

There's a great write up here: https://forum.avidcnc.com/t/vertical-workholding/34/11