This is a single-sided version of the makerbot stepper driver board v2.3 http://www.thingiverse.com/thing:393I tweaked the board to make it easier to etch and make at home. The vias are not underneath components, simple wire links can replace the tracks on one side of the board, and the track sizes tweaked a bit. It can still be improved. I've managed to etch and build 5 of these boards and at least 4 are working OK. The components are identical to the Makerbot version (see http://www.thingiverse.com/thing:393 ) and the board instructions are similar. My version just has all the through-hole connectors soldered through, and the plugs go into the underside of the board (viewed from the SMT side).