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Information about the 32bit mainboard which ships with newer versions of the Anycubic i3 Mega
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Latest commit fc55845 Aug 24, 2018
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generic_boot20_pd3.bin Add files via upload Aug 22, 2018
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trigorilla_pro.psd Add files via upload Aug 24, 2018

Trigorilla Pro mainboard

  • 32bit Cortex-M3 MCU (STM32F103ZET6)
  • Soldered A4988 stepper drivers
  • WIFI slot layout matches ESP-01 layout
  • Manufactured by cbd-3d?
  • PL2303 USB to Serial (max baudrate seems to be 230400)
  • mainboard


  • Datasheet (Page 27)
  • PB0: Beeper
  • PD3: LED
  • PG4: Capacitor? (Power LED turns off slowly if pin is set HIGH)
  • PA9: Serial USB Communication?

Flashing bootloader

  • Install Arduino STM32
  • Remove JP1 jumper and set SW1 jumper to USB mode
  • Use stm32flash tool located in Arduino_STM32/tools/..../stm32flash
  • ./stm32flash -b 230400 -w generic_boot20_pd3.bin -v -g 0x0 <port>

Stepper driver replacement


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