Update: I ditched the Arduino shift register idea. I just couldn't seem to get anything to happen. So I picked up a parallel port pci card off Amazon, put it in my desktop and installed LinuxCNC. It seems to be running very well. I found out my stepper board does half step micro stepping, its running smooth and I've tuned my Z axis down to 0.008-0.025 inch. I think this will be good enough for now. I'm going to start working on the x and y. I'm still not sure what I'm going to get to run my extruder.
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