Wow I just read this thread and am in utter awe. Russ you have done what I've been wanting to do for over a year. You helped me to make up my mind on what kind of reprap I want to build. At this point I have an audrino mega 2560, a ramps 1.4 board 12 lm8uu bearings, 608zz bearings, a heated bed etching and a lot of discarded 8020 extrusions. I need to get the driver boards and nema 17 motors. Also I was thinking of using the extrusions with some 8mm drill rod and lm8uu bearings kind of a hybrid design. It would be awesome if the audrino was able to run nema 23 motors as I have a few of them laying around but I think it would be better to bite the bullet and buy the nema 17's and drivers.