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LongBoard CNC Controller





The LongBoard CNC controller is a powerful, three-axis CNC controller that acts as the brains and brawn of the LongMill. The four drivers are made to power any two-Y-axis CNC setup.

Each LongBoard comes with:

  • Fully assembled control board
  • Detachable screw terminals for motor and I/O connections
  • Pre-flashed and installed Arduino UNO with 1m USB cable

*Please note that your order of the LongBoard ships with the latest version of the controller. The latest version also comes with an external e-stop button.*

*Please note that your order of the LongBoard does not come with a power supply. If you require the power supply with your LongBoard, you can purchase one at the link here https://sienci.com/product/24v-12-5a-power-adapter-for-110vac/*

Order your CNC controller with or without the outer steel enclosure.

Details on the board design, Gerber files, and other design and assembly files can be found on our LongMill Open Source Page.

LongBoard documentation can be found here in the LongMill Resources.

Please note, if you have a MK1 machine, you will need to flash your firmware to the correct machine profile. You can learn how to flash your firmware here. https://resources.sienci.com/view/lmk2-grbl-firmware/#flashing-grbl-using-gsender

Additional information

Weight5 lbs
Dimensions8 × 4 × 3 in

MK1 Control board only, MK1 With outer case, MK2 Control board only, MK2 With outer case


The LongBoard is a powerful, all in one control board running the GRBL Firmware designed for use with 3-axis small to medium size CNC machines.

Input power

Voltage: 24V-48V

Current: Max 16A

We recommend using our 24V 10A power supply with your LongBoard.


The LongBoard uses four Toshiba TB6600 drivers, with one driver used for the X and Z-axis, and two for the Y-axis.

Microstepping: 1, 1/4, 1/8, 1/16

Max current: 4A


The LongBoard comes pre-flashed with the latest LongMill firmware on an Arduino UNO


The LongBoard comes with several inputs and outputs supported by the GRBL firmware. These include:

  • Spindle/laser control
  • Coolant control
  • Probe input
  • X, Y, Z homing/limit switches
  • 12V auxiliary power for active fan cooling
  • Buttons for Play, Pause, and Stop
  • Power switch


  • When plugging and unplugging motors and other periphery, ensure that the control board is powered off.


The LongBoard CNC Controller has a 60 day warranty once it’s received.

We want you to have a great experience with our products, so if any parts are found to be missing or damaged, please email us.

You may cancel an order if it has not shipped yet, please contact us if you wish to do so.

General Warranty and Limits of Service:

Effective February 13, 2020

Throughout this policy the words “we”, “us” and “our”, or “Sienci Labs” will be used to refer to Sienci Labs Inc. herein and “LongBoard CNC Control Board”, “LongBoard”, or “control board” will refer to Sienci Labs’ LongBoard CNC Control Board. Additionally, the words “you”,  “your”, “user”, and “operator”  will refer to the original purchaser/customer, user, or viewer of any of the products or media provided by or through Sienci Labs.

Sienci Labs Inc. (the “Company”) grants the LongBoard (the “Product”) a standard warranty within Canada and the US to the original customer to be free from missing parts, defects in material, and defects in workmanship for a period of sixty (60) days from the date of receipt by the original purchaser. Sienci Labs Inc. will ensure that the appropriate support is provided to the original customer to replace defective products, restore the LongBoard to operational condition, or provide a full or partial refund under the sole discretion of the Company.

This warranty does not cover damage due to improper use or assembly, lack of maintenance, normal wear and tear, or modifications to the LongBoard which are not produced or authorized by the Company. Consumables such as cutting tools and sample or stock materials that may have come with your LongBoard are not included in this warranty.

This warranty will become void if the operator does not follow the Safety Warnings and Guidelines, uses the Product for illegal purposes, uses the Product beyond its intended specifications, or intentionally causes damage to the Product.

The original customer must contact Sienci Labs Inc. within sixty (60) days of receiving their order to make a warranty claim to be eligible for warranty service. Proof of purchase, tracking number, email address, or other material will be used to confirm the original purchasing date and the identity of the original customer. If the damage was due to shipping, original packaging materials must be kept in the original received condition. Photos, videos, written descriptions, and other items may be requested to assess and validate a warranty claim.  In the case Sienci Labs Inc. requires the original parts to be returned, the customer is solely responsible for packing all items securely. Damage incurred during return shipping will not be covered by the warranty. A method of payment such as a credit card may be requested by Sienci Labs Inc. to cover shipping costs or damaged items if Products are not eligible for warranty service.