Everything is out of stock EVERYWHERE, so I picked up an Arduino Mega (Makerbot.com says that's the platform their moving toward anyway, so yeah, by the time I figure everything out the WILL... right?... have firmware compatible with the Arduino Mega!... hopefully anyway... not to worry though - the firmware is not horribly complex, so if I have to hack it together for myself, I will.
Also picked up 4 - NEMA 17 Stepper motors from www.TrossenRobotics.com
Also picked up 4 - EasyDriver Stepper Motor Controllers from the same - they are the ones made by sparkfun (VERY easy to use)
Once I have a hardware platform up and running, I'm probably going to pick up a couple of Arduino Pro Mini to use for the controllers. 1) they are based on the ATMega328, so pleanty of RAM for a MOBO and Extruder controller and 2) they are FRIGGIN CUTE AS HELL!
In all, my mobo with steppers and extruder controller with stepper will be smaller than the makerbot's mobo and extruder without stepper controllers. (bothacker has built a Seeeduino shield and is using the same stepper drivers as I am... so this is along the same lines I'm working toward)
that's it for now - will keep posting my progress.
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Thank you so much for your comments/feedback/thoughts :D