The BotStep17 plugs into the MightyBoard to control the stepper motors on your MakerBot Replicator.Designed by Harry Mulliken.This is part of The MakerBot Replicator, which you can find at http://www.thingiverse.com/thing:18813Botstep17 SpecificationController Chip Allegro A4928 Max. Motor Voltage VBB 28V Max. Logic Voltage VDD 5.5V Max. Power Dissipation (no heatsink) 2.0 W Default Vref voltage VDD x 0.267 +- 2% Default Motor current Vref/2.16 +-10% Rosc GND (mixed decay mode) Table 1. Microstep Resolution Truth Table