RAMBO v1.2g - 3D printer controller board

RAMBo v1.2 3D printer controller board

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  • RAMBo v1.2 3D printer controller board
  • RAMBo v1.2 3D printer controller board
  • RAMBo v1.2 connection diagram
RAMBO v1.2g - 3D printer controller board
Excl. Tax: $72.00 Incl. Tax: $90.00

Availability: In stock

In Stock

RAMBo V1.2g for Dual extruder MakerBot Delta Rostock Duplicator RepRap


RAMBo version 1.2g (with varistor)
(RepRap Arduino-compatible Mother Board) is an all in one motherboard targeting convenience, reliability, and performance.


The board is equipped with the varistor fix essentially upgrading it to version 1.2g


  • Arduino MEGA compatible Atmega2560 and Atmega32u2 processors are compatible with all RAMPS class firmware
  • Crystals for both usb and mcu (timing accurate to 10ppm)
  • 4 Thermistor jacks
  • All extra pins broken out on both processors (allows using the 32u2 for LUFA AVR programmer, etc.)


Motor Drivers

    • 5 A4982 1/16th microstep motor drivers(2 connectors on Z for Prusa Mendel and other dual Z printer designs)
    • Digital Trimpot for stepper current control
    • Current limit on driver IC VCC to prevent permanent latchup
    • Microstep mode configured by MCU through firmware (no jumpers needed)
    • Test points for driver control signals
    • Step and Direction pins are on their own ports for synchronous movement capability
    • Extra driver ports broke out for up to 3 additional drivers (some of the motor extension pins are shared with max endstop and a pin allocated for SPI-SS extensions)


PWM DC outputs (Extruders, Fans, Etc.)

  • 6 outputs
  • Low resistance mosfets for cool running
  • Indicator led for each channel



    • Three independent power rails for flexible input power configurations
      • Heated Bed, 15A 12-35V
      • Extruders + fans and logic, 5A 12-35V (fuse can be exchanged for up to 10A capacity)
      • Motors, 5A 12-35V (fuse can be exchanged for up to 10A capacity)
    • Built in SMPS for 5V generation from Extruders + fans and logic



      • 4 layer
      • 2oz copper on all layers
      • High quality, High temperature FR4-TG130 PCB
      • Gold ENIG finishing


Compared with the 1.1b version´╝îRambo 1.2G has the following updates:

1. Increased ESD (Electro-Static discharge) Electrostatic Discharge in the USB circuit section

2. The logical part of the circuit and MOSFET share the same power supply

3. enhanced anti-interference ability of signals.


FAQ / Troubleshooting

Please see reprap.org

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