Mitch Schoch from SimpleVoice.com built an interesting 4 axis DIY Foam Cutting CNC Machine. It has lots of control since all 4 motors can be driven independently. His design is modular, he has used phone jacks and 24 gauge phone cable to provide power the motors. Everything was purchased from the local hardware store so there are no exotic parts in the unit. From the video he looks to be using standard threaded rod and some big drawer slides to provide smooth motion with the use of the stepper motors.
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