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Design Goals * PCB easily to manufacture on a RepRap. * All parts on one board. Except for the Opto Endstops, of course. * Enough components to run a Mendel or Huxley with extruder and heated bed. * Easy to set up. For example, this would include an USB port. * Well available and cheap parts. * Based on the ATmega644. * Well suited for community driven development. Features * Single board solution. * Single sided PCB. * Pololu stepper drivers, exchangeable. * 4x stepper motor drivers with 1/16 microstepping. * TODO: on-board USB-RS232 converter. * Integrated hardware for driving one extruder (stepper, heater and thermistor). * Integrated hardware for a heated bed (heater, thermistor). * Integrated hardware for driving a fan. * Ready to be hooked up on a generic PC power supply unit (PSU). * Use of standard connectors. * Debug LEDs for power, Fan and both heater outputs. * Can turn PSU on and off in software. * Reset button. For more details, see http://reprap.org/wiki/Generation_7_Electronics