Well, Design of an home made electronic kit for my 10yo daughter to teach her by example. on 74HC595 (shift reg), 9 leds, 4 push buttons, some wrapping wire, ... We managed to build it, it works, with some bad contacts, but it works, she enjoyed the thing and the time spent together. Here is the schema and the pictures. I strongly invite parents to build it with their children, easy and fun. !
My 3V Node (Atmega328P 1MHz), embedded NRF24L01+ with ceramic antenna, ATSHA256, AT25DF512, BME208, LED, Battery monitoring, ICSP, FTDI, Castelizable, Breadboardable. 
Well,in my case, I mounted and tried to fix bugs in my very first design. This is supposed to be a castelizable Sensebender compatible node, embedding NRF24L01+, LED, Temp/Humi/Press sensor, Memory, crypto, with most of the IO exposed. The updated design is online, but still work in progress. 
project on OpenHardware
Hi @sundberg84 , Just in case, I redesigned the whole thing to fix some issues. This is still a work in progress, but it is very close to the final design.
@skywatch The issue I can see with steppers is that your camera might move when you poweroff the motors. As you said, when you poweroff them, they wont go back to center, but they also wont keep the position. If your camera is not perfectly balanced, it will "fall down". As well as your 3D printer : as long as you power the steppers, you can not move the axis, but as soon as you poweroff them (unlock) , you can move your axis.