Printbus,
Wow! I'm amazed. I completely missed that thread. I'm very glad you pointed me to it. Thanks, once again, for this thread and for all you provide for us within the MakerFarm community.

I'll need to find time (hopefully tonight) to go over your thread in detail but just from skimming it I'm getting a good idea on where to go from here.

My iv3 currently has the stock 12BHH48 motors. I also happen to have some Nema 23 motors hanging around from a cnc router build that I have yet to even start on . I wonder if we could crank up the z axis feel rate with these motors? Even if so, I doubt the benefits would justify the cost of two Nema 23s.