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I have no experience with the raspberry pi as a cnc or printer. Ramps is much cheaper and more widely used. I looked into linuxcnc and it didn't fit my needs. The currently recommended software is cheap/free and easy. I need to be able to multitask while my cncs are running for hours on end and linux isn't an option for me at this point.

1- You can use home alarm cable, stranded, or cat5-6 cable.

2- 10-12" should be pretty good.