Geeetech New Version RepRap Printrboard 3D Printer Control Board (RepRap electronics sets) Four integrated Allegro A4982 Stepper Drivers Printrboard is a derivative of Teensylu, an AT90USB1286 development board originally based on Sanguinololu Four integrated Allegro A4982 Stepper Drivers (no Pololus needed) Onboard SD card slot having expansion headers supporting I2C, SPI, UART, and ADC pins