The special version of BBP 1, including 7 steppers driver to support 3 extruder for color printing, 1 thermocouple interface which allows you to print high temperature materials, 3 extended interface for steppers and heaters so you can add more extruders in your printer.


  • Texas Instrument Sitara AM335X, 1GHZ Cortex-A8 ARM
  • 2 programmable Realtime Units (PRU) to generate really high frequency step and dir signals
  • 4GB eMMC
  • 512M DDR3 memory
  • 10/100M ethernet
  • microSD Card
  • USB Host to connect USB disk, WiFi, Camers .etc

Stepper drivers

  • 7 drv8825 stepper drivers
  • 1/32 microsteps
  • Each capable of driving bipolar steppers up to 45V and 2.5A
  • Digital control of the current setting for each driver


  • 3 heaters, 2 for extruder and 1 for HBP
  • 6 connectors for fan or led light belt


  • 3 thermistor inputs
  • 1 thermalcouple (max6675) input
  • 6 endstops, 3 for min limit switch, 3 for max limit switch
  • 1 connector for external power button


  • 50 pins FFC connector for 24 bits TFT LCD and touch screen
  • Connector for 1 extended stepper
  • Connector for 3 extended heaters
  • Serial connector for debug
  • Lots of pins broken out, including stepper control signals and pwm control signals for heaters
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