Suited for Advanced Users

Assembled RAMBo 1.3L Kit

This all-in-one 3D printer motherboard is made by Ultimachine using an Arduino MEGA microcontroller board, and comes equipped with integrated stepper drivers, built in fuses, and more. Please note that this particular RAMBo configuration does not include any wires or connectors.

  • Features

    RAMBo v1.3 is built on the shoulders of the Arduino community, so hackers should consider this motherboard for additional projects beyond controlling a 3D printer.

    Curious where the product's name comes from? This motherboard is a full remix of Ultimachine's popular RAMPS design, with the Arduino MEGA and stepper drivers all on one integrated PCB. Thus, the name (R)epRap (A)rduino-MEGA-compatible (M)other (Bo)ard (RAMBo) was born.

  • Parts & Specifications

    Parts Included

    One (1) RAMBo electronics board


    • Designed and Manufactured by Ultimachine

    • Logic

      • Arduino MEGA compatible Atmega2560 and Atmega32u2 processors are compatible with all RAMPS class firmwares

      • 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.)

      • 2 channel SDRAMPS compatible SPI breakout

    • Motor Drivers

      • 5 A4982 1/8th microsteps motor drivers with 1,1/2,1/4,1/16 as options (2 connectors on Z for Prusa Mendel)

      • 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 broken 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

    • Power

      • Three independent power rails

      • Heated Bed, 15A 12-35V

      • Extruders + fans and logic, 5A 12-35V (fuse can be exchanged for up to 10A capacity)

      • Motors, 5A 12-28V (fuse can be exchanged for up to 10A capacity)

      • Built in SMPS for 5V generation from 10V-26V Vin

    • PCB

      • 4 layer

      • 2oz copper on all layers

      • High quality, High temperature FR4-TG130 PCB

      • Gold ENIG finishing

    • Fuses

      • 2 user replaceable NANO2 fuses

        • Part number: 0448005.MR

        • F2: motors and on-board power supply

        • F3: extruder heater + fan outputs and logic

      • 1 user replaceable automotive fuse 

        • F4: automotive-type 15A ATO bladed fuse to for the heated bed