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SuperLongBoard Pre-Order


The SuperLongBoard 5xHAL is a next-generation 32-bit controller for the LongMill, open-source for other CNCs as well. Please note that this is a pre-order*.

Look forward to everything that the original LongBoard (typical grbl) can do…plus:

  • Faster movement and jogging speeds
  • Quieter motors
  • CNC status lights with support for external lighting
  • Safe E-stop depowers motors and disables accessories
  • Programmable action buttons to suit your workflow
  • Faster probing and higher sensitivity with touch plates
  • Higher level spindle control using RS485**
  • Smoother and faster laser motion and engraving
  • Independant 4th/Rotary axis output for simultaneous 4-axis cutting
  • USB-C and Ethernet connectivity to computer with extensive shielding and onboard ferrites to improve communication reliability

See updates or learn more from our big blog post, most recent update, Livestream Launch or from our FAQs below ↓

*Controllers are expected to ship in March 2024. Please note that if you order when SLB is on backorder, these controllers are expected to ship in May 2024.
**List of compatible spindles to come soon.

36 in stock


Supercharge your CNC

The SuperLongBoard, or “SLB”, is an advanced, next-generation, plug-and-play, CNC controller for ALL GENERATIONS of the LongMill. The SLB allows your CNC to run faster and more reliably. We believe the SLB is the most significant upgrade in functionality and performance for all LongMills, past and present.

Each order will comes with:

  • The SuperLongBoard in a protective aluminum enclosure
  • Detached E-stop with customizable action buttons
  • 2.5m E-stop cable
  • Mounting flanges for four, screw size #4 to #8
  • Mounting bracket, specific to use on the Y-axis of a MK2 (not MK1)
  • *You’ll need to provide your own minimum 24V 10A power supply, we supply these and all past LongMills have shipped with one

The SLB creates a platform for our company to continue developing and bringing advanced features and improvements to the LongMill and other CNC machines in the future.

There are way too many updates and changes we’re bringing with the SLB to mention all of them, but we’ll continue to show functionality and answer questions as we get closer to production. For company updates in the meantime, keep an eye on our Blog or get news directly to your inbox by signing up.


Q: When will the SLB ship?

A: The SLB is expected to start shipping in March 2024. We will continue to post updates on our Blog. To get news directly to your email inbox, feel free to subscribe to our mailing list.

Q: Will my card be charged right away when I place the pre-order?

A: Yes, we require full payment for the pre-order. You may cancel at any time before your board ships for a full refund.

Q: Can the SLB work on my LongMill?

A: The SLB is compatible with ALL LONGMILLS. No matter what size, generation, or version you have, the SLB will plug and play with existing LongMill hardware of all generations with minimal settings changes. We believe this will be one of the most substantial upgrades any LongMill can have, past or present!

Q: Should I buy an SLB now? Will the SLB come default with the LongMill in the future?

A: That’s up to you. SLBs will eventually ship standard with the LongMill but at that point we’ll also be increasing the price of the machine to reflect the additional value we believe the SLB provides. This means if you want a LongMill, but are also interested in the board, buying now will cost around the same as buying later – the only difference being that you’d already be making chips on your CNC before your SLB arrived.

Q: Can I use the SLB with a non-LongMill machine?

A: For most hobby CNC machines, most likely yes. Besides testing the SLB on LongMills, we’ve also been testing the SLB on Ian’s Onefinity. In theory, you should be able to use the SLB on most hobby CNC machines that use open-loop stepper motors. You will need to change certain settings such as the steps per mm and direction, and it should be noted that the drivers have been tuned to work best with the NEMA 23 motors used on the LongMill, we expect users to use the SLB on other machines as well. We hope that in the future, users will provide configuration settings for different CNC machines. At this time, we do not have plans to adapt the SLB for use on other CNC machines, so we’ll likely rely on the community for this.

Q: Is the SLB open-source?

A: Yes, the SLB, firmware, and related software like gSender will be released open source. This may come at a later date when we feel that our designs are finalized and should be available soon on our Resources pages.

Q: Will the SLB support external drivers?

A: Although we will support an external A-axis driver support to allow full 4-axis motion with the Vortex Rotary Axis, the SLB will not have support to external drivers for the X, Y, and Z axis.

Q: Will the SLB support accessories like the Vortex Rotary Axis, Autozero touchplate, or LaserBeam?

Yes, the SLB will support all of our existing accessories for the LongMill, as well as opening up additional improvements and functionality to accessories, such as improved laser motion control, fully independent 4th axis control, and improved speed and sensitivity on touch probes and plates.

Q: Will the SLB support toolchangers?

A: The SLB does come with the hardware to support the IO for a toolchanger, such as relay control and tool length sensor inputs. However, we have not yet tested the functionality for a tool changer with the LongMill.

Q: Does the SLB come with a warranty?

A: The SLB comes with a standard 90-day warranty once it arrives at your door against all manufacturing defects. For further conditions, please check out the warranty tab on this page.

Details for returns can be found on our store policy page.

Additional information

Weight5 lbs
Dimensions6 × 8 × 4 in


The SuperLongBoard comes with a 90-day warranty starting at the time of arrival to the customer against manufacturing defects. Those 90 days are also covered for use of the board as long as it uses:

  • A correctly-specc’d and high-quality power supply like the 24V 10A or 24V 12.5A ones we’ve shipped with our LongMill CNCs
  • Tested and approved firmware developed by Sienci Labs without modification to the source code

Please note that power supplies with the incorrect output voltage and/or current may damage the board. We also strongly recommend using default or recommended settings for the SuperLongBoard. Damage caused by incorrect settings may not be covered by warranty or assessed on a case-by-case basis.