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Atmega 3d-printer mainboard

Velleman VM8400MB: ATMEGA 3D-Printer Mainboard

Velleman VM8400MB

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Velleman VM8400MB - ATMEGA 3D-Printer Mainboard

The Velleman VM8400MB ATMEGA 3D-Printer Mainboard is a high quality, open source controller board for 3D printers, soft material CNC routers or your own project. It’s based on the ATMega2560 microcontroller and uses DRV8825 stepper driver boards (i.e. Velleman VM8400DB).

This is the main controller board used for Velleman’s own K8400 3D printer. It’s packed full of features and is easy to use.


  • Outputs:
    • X, Y, Z, E1 and E2 stepper motors
    • E1 and E2 heater
    • heated bed
    • 2 x unregulated DC output
    • 2 x fan
  • Inputs:
    • X, Y and Z end stops
    • E1, E2 and heated bed sensor
    • Power supply screw connector
    • Power supply 2.1/5.5 mm DC jack
    • Reset button
  • I/O for:
    • LCD display
    • Rotary encoder with pushbutton
    • SD-card holder
    • Custom external circuitry
    • In-circuit programming
  • Extras
    • Status LEDs
    • On-board RESET button
    • Male board-to-wire connectors
    • Space for optional IDC male header connectors


  • Power supply: 12 - 15 VDC
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Info Sheets

Overview of Velleman modules that are equal to D.I.Y Kits
This sheet is useful when you want to know which modules you could find in the do-it-yourself range of Velleman Kits and minikits.

Frequently Asked Questions

Q. Hi, Can you add stepper motors to this board?? I need a total of 8. Please let me know! Thanks!


The VM8400MB is the replacement mainboard for the K8400 3D printer. Although we have not tested adding 8 stepper motors to the VM8400MB, you are more than welcome to try it as it is an open-source product.

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 Warning: this product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov/product