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The Adafruit steppers are a perfect match for your original model. I have them all mounted and ready to be wired up. The only problems I am having are of my own making. I wanted to use gt2 pulleys, as I have an abundance of gt2 belt. The pulley I made for the Y axis works wonderfully, but not so much for the X axis. I think my efforts to refine the pulleis went to far and I have to try another. I'm also going to try this http://store.cutedigi.com/cnc-kit-for-arduino/ as a controller. I have to build a circut for the heater and thermistor, but that is not difficult.

However, Ischool has started and I have inherited some new responsibilities and my grand daughter is (as we speak) making her way into the world, so I'll have to put this aside for a bit.