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LongMill Benchtop CNC MK2

(367 customer reviews)




LongMills are expected to ship within 3-4 weeks from the time of order. Each machine is made to order. Please Note: “In Stock” means we can accept orders, but LongMill Beginner Kits are currently unavailable to ship immediately.

The LongMill MK2 is a powerful and affordable hobby CNC router perfect for any workshop. Scale it to your needs by choosing from one of its three flavors: 12×30, 30×30, and 48×30.

The machine name roughly corresponds to its cutting area in inches and each machine has 125mm (~4.9″) of Z-axis travel.

Not sure what you need to order for your LongMill? Check out the Beginners Kit.

Shipping is calculated at checkout.



Turn your ideas into a reality with the LongMill Benchtop CNC MK2

The LongMill helps you take your woodworking and fabrication to the next level. Its range of workable materials includes any species of wood, a variety of plasticssoft metals like aluminum and brass, and a variety of machinable foams and waxes for model making or metal casting.

We designed the LongMill to be the best hobby CNC router in its class, offering rigidity, and reliability. With large extruded aluminum rails, fully supported Y-axes, 1/4″ steel gantries on all axes, high power NEMA 23 motors, and high precision MG-12 type linear guides on the Z-axis, the LongMill MK2 is the most powerful CNC router in its class at its price point.

This kit comes with:

  • All rails, gantries, fasteners, lead screws, and other hardware parts to make a complete LongMill
  • All electronics, including power supply, controller, drivers, and motors.  Please Note*Power supplies are 110V only, (North America).  If you live in a country with 220V/240V power, our standard LongMill MK2 power adapter must use a transformer with a rating above 300 watts to convert their power to 110V/120V
  • Assembly instructions and resources
  • Excellent lifetime technical support during the life of your ownership

Tools and supplies needed for assembly (not included in the kit) are

    • 3/4″ MDF sheet to act as a working surface
    • An electric drill or screwdriver
    • A laptop or computer
    • A router and end mills (for purchase separate on our store)

For routers, we recommend the Makita RT0700/RT0701. It’s reliable, powerful, speed-adjustable to a large range (10-30K RPM), and its uniform outer body allows for versatile z-axis mounting. We’ve been using the Makita on our CNC machines for years. The LongMill MK2 comes free as standard with a 65mm router mount, which is compatible with the Makita RT0700/RT0701 and most variations of this router design. If you wish to use a different size router or spindle, please check out the other sizes that we offer.

*Routers that we supply will be 110V only (North America). If you live in a country that uses a different voltage, please purchase a router in your region. 

The LongMill comes with free software and is compatible with dozens of other paid and free software. Try our Toolchain Wizard to get a quick recommendation for software that may work best for you.

Additional information

Weight60 lbs
Dimensions8 × 10 × 41 in


For dimensioned drawings all of the machines, please download our PDF document. If you’d like to see some tables that our community members have built for their own machines, we’ve got a page on it here: Community Table Builds. If you’re looking to properly size a space to put your machine or are making a dedicated table, ensure that you leave enough room for the LongMills control box and any other peripherals that you might be using like a laptop, monitor, keyboard, etc. The control box is roughly 150mm x 280mm, has holes so that it can be easily screwed or mounted to any surface, and has a USB port on its left side which allows you to connect your computer to control the machine.


You can include add-ons to improve the functionality of the LongMill. These are all optional. For additional add-ons, please see our Add-On section of our store.

Makita RT0701 Router

We recommend using the RT0700/RT0701 Makita trim router with your LongMill (we only sell the 110V version). This router comes with speed control from 10,000 to 30,000RPM and has 1.25HP of power. This router is compatible with 1/4″ shank tooling and can be adapted to 1/8″ shank tooling using a 1/4″ to 1/8″ collet adapter.

Dust Shoe

Our Z-axis independent, magnetic dust shoe allows you to attach standard vacuum hoses to your CNC machine, allowing it to suck up dust as it’s cutting, making clean up easier and keeping dust out of the air. This dust shoe is adjustable in the Z direction, and the front bristles and vacuum hose can be easily detached to make it easy to change bits.

Touch Plate

Our 3-axis touch plate allows you to set the ‘origin’ or starting point of your cutting tool very accurately based off the surface of the material you’re going to be cutting. Place the touch plate onto the corner of the material to locate the cutting bit in both X, Y, and Z-directions to start your cutting job, or use it to set the Z-height of the tool to accomplish tool changes on more complicated projects.

End Mill Starter Set

Our End Mill Starter Set comes with a basic set of end mills to get your started for many projects you might have in mind. Each pack comes with:

LongMill MK2 Dust Shield

Prevent dust and debris from getting into your Y-axis lead screws with our dust shields designed for the LongMill MK2. Each pair of dust shields are made from formed sheet metal which are easily installed between the front and back feet of your machine using M5 hardware. Please note that the ACME lead screws and Delrin Anti-backlash nuts used on the LongMill are designed to work in dusty conditions and the dust covers are not required for general use. Please note that this dust shield only fits the LongMill MK2 30×30.

Inductive Sensors

Inductive sensors allow users to add homing and limit switch functionality to their machines. We only recommend this kit to advanced users


What materials can it cut?

The LongMill is primarily designed for cutting wood but is capable of cutting foam, plastic, and soft metals such as aluminum and brass.

Where can I buy end mills and other tooling?

End mills and bits are available on sale on our website as well as online such as Amazon and Ebay, or at your local hardware store such as Home Depot or Lee Valley.

What software can you use with the LongMill?

The LongMill is compatible with dozens of free and paid CAM software. The LongMill is compatible with standard G-code. You can check out our resources page at www.sienci.com/resources and look under the software tab. We’ll be hosting webinars and creating additional resource videos to help you learn to design and program your CNC machine.

What system requirements are there?

You can run your machine off virtually any modern laptop made in the last 5 years running Windows, Mac OS, and Linux.

We’ve tested our machine with Intel Celeron and AMD Phenom processors with less than 2GB of RAM with no issues (although it is a bit slow).

For any other downloadable CAD or CAM programs that don’t run on the cloud, please check with the software creator for minimum system requirements.

What spindles or routers can I use?

While we recommend the Makita RT0701/RT0700, you can also use other trim/palm style routers. You will be able to let us know what tool you want to use and we will send you the appropriate mount.

Will there be 4th or 5th axis support?

In the immediate future, there will not be 4th or 5th axis support for the LongMill.

If you would like to implement an additional axis to your machine, we encourage users to try creating their own and sharing it with the community!


The LongMill has a 90 day warranty once it arrives at your door.

We want you to have a great experience with your machine, so if any parts are found to be missing or damaged, please email us. We will ensure that you receive the support you need to restore your LongMill to operating condition or provide a full or partial refund.

You may cancel an order if it has not shipped yet, please contact us if you wish to do so. We do not offer returns for LongMills that have already shipped.

General Warranty and Limits of Service:

Effective March 4, 2019

Throughout this policy the words “we”, “us” and “our”, or “Sienci Labs” will be used to refer to Sienci Labs Inc. herein and “LongMill” or “machine” will refer to Sienci Labs’ Sienci LongMill 12×12, Sienci LongMill 12×30 and Sienci LongMill 30×30. 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 LongMill (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 ninety (90) 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 restore the LongMill 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 LongMill which are not produced or authorized by the Company. Consumables such as cutting tools and sample or stock materials which may have come with your LongMill 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, intentionally causes damage to the Product, or transfers the Product to another owner.

The original customer must contact Sienci Labs Inc. within ninety (90) 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 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.

367 reviews for LongMill Benchtop CNC MK2

  1. Charles (verified owner)

    Love the machine but the Vcarve software and Burnlight software are hard to learn

    (1) (0)
  2. Jon Z. (verified owner)

    I feel the price of the machine is very good considering what it can do. Not sure you can find another machine at this price with this quality.

    (1) (0)
  3. James R. (verified owner)

    I’m a newbie to CNC, but it was easy to assemble, and us plenty sturdy. If you’re on the fence about buying, wait no longer, you will be extremely satisfied.

    (1) (0)
  4. Edward Freeman (verified owner)

    I was a little skeptical on whether I should buy the MK2 30×30 CNC. Then I watched a video from Garrett from IDC Woodcraft. He recommended this machine and seeing that I had a smaller CNC which only did 12×12 I needed something larger so I purchased it and I’m glad I did. I do craft shows and make American Flags and this machine is just what I needed. As long as you follow the directions it was fairly easy to put together. And the software G sender is very user friendly. That is why I gave this a five-star rating.

    (1) (0)
  5. Marcus Pedroza (verified owner)

    Overall great machine, I have 0 experience with CNC. A few areas I think could be improved upon. Putting together was not terrible, maybe 4 hours with stops and starts. Only a few places where instructions/pictures did not show what I needed. I did like that they sent plenty of spare parts! Would be nice to have information on how to set up limit switches, a short run through on a project from start to finish would be nice, and how to set up vcarve pro with your machine. Also videos on how to setup gsender would be helpful. I am running with the factory settings, but would be nice to know the bells and whistles. I figured most issues out on my own, with the help of YouTube, but as a new user it would be helpful if the information were there from start to finish. Some basics on spoil boards and holding materials would be appreciated.

    Overall customer support has been amazing, very quick response, and very helpful. One thing I would like to see is a way to tram the z axis. When making my spoil board it is slightly off. Not easy to “shim” the router, since the housing is round. All the engineering that goes into this seems like an adjustable mount would not be hard to add. Still learning but glad I purchased. I have been making signs and the learning curve is shortening. One thing I will say is it is apparent I need a planer! If the material is not perfectly flat the router with show defects in height.

    Signs are getting better as knowledge with vcarve is getting better. There are some great teachers on YouTube that walk step by step.

    (1) (0)
  6. Robert C. (verified owner)

    Assembly was a breeze, indeed it took longer to make the table than set up the Longmill on it. For now, I am in the learning phase. I have chose the economical choice of the free version of Fusion 360, the open source Blender for meshes to import into Fusion, and your Gsender program as software choices. Lots to learn.

    (1) (0)
  7. Gary S. (verified owner)

    Very happy with the machine and the support from Sienci Labs. I look forward to many years of use.

    (1) (0)
  8. Timothy Williams (verified owner)

    Needs more router support than just one clamp. Needs easier tramming.

    (0) (0)
  9. Brett S. (verified owner)

    I had experience with an industrial 4’ x 8’ CNC router with vac table and ATC, so I wanted more than a tiny hobby machine. After lots of research and reviews I settled on the 48 x 30 Longmill MK2. This is a great machine for the price. I was really impressed with how it was packaged and the assembly instructions were superb (I like the online documentation and ability to save a PDF). After a few tweaks and adjustments, I was up and running. I’ve added T-track for job holding and 6” wide MDF pieces for a replaceable spoil board. Have already used it for some holiday decorations and cut out the primary pieces for a desk I’m making for my granddaughter. Keep up the good work!

    (1) (0)
  10. Deryl Bastarache (verified owner)

    Don’t understand how I managed this long without this! The possibilities with this CNC are endless. The only problem I found is when you have a question about something it is very hard to find an answer. The forum is in my opinion useless. Not made for newbies and there questions. Product is fabulous and will most likely be purchasing another in the future.

    (0) (0)
  11. Anonymous (verified owner)

    Well priced Cnc. The customer service has been excellent. The instructions for assembly could be better but if you review them before hand and watch the videos they are good.

    (0) (0)
  12. Phil G. (verified owner)

    I got the MK2 just over a month ago. I absolutely love it and want 5 more. With that being said, I used to run Cnc machines 16 years ago with programming experience, but…..16 years ago, so I needed to hop back on the bike per say.

    The machine assembly was pretty well instructed via online and instruction manual provided. It will definitely take your time. Even an experienced person it should take a couple of days to properly hone in.

    The customer service was great, and I had my Longmill MK2 within a week, and so far, there is no need to contact the providers as the machine had run great.

    Things I have been making , Christmas boards, signs , plaques, and various one-offs. Immediately have people want more and more once they get the product without a doubt I recommend this to any Cnc hobbiest.

    5/5 great purchase

    (0) (0)
  13. Darcy Stelte (verified owner)

    Overall an excellent machine and the instructions are bang on. I had mine up and running in 3 hours. For the price you can’t go wrong with the MK2. Personally I do not like the dust boot. I have put mine aside and ordered a new one from a different manufacturer. I have made some signs, keepsake boxes and hundreds of cribbage boards in the short time I have it. So far I have had to adjust the wheels and lube the Z axis. Also I wish they would find a different way to attach the manner to the wire for the probe plate. Mine keeps coming apart. The little eye attachment simply Dosnt grab the wire enough.

    (0) (0)
  14. Leon StGeorge (verified owner)

    I don’t use it. It was bought as a gift. He is learning and practicing with it.

    (0) (0)
  15. Anonymous (verified owner)

    I have no experience in CNC what so ever. The machine assembly was straight forward. The machine is solid. My only regret is not purchasing the bigger one

    (0) (0)
  16. Jeffery Hinkley (verified owner)

    Terrible instructions, machine is till not working

    (0) (3)
  17. Rob P. (verified owner)

    Best price I found for similar machines and when paired with Vectric Vcarve Pro my cnc router experience has been incredible. Some projects I have done are signs, tool holders for my small shop, spoilboard clamps and my custom spoilboard

    (0) (0)
  18. Anonymous (verified owner)

    The support is top notch from sienci
    Any and every question is answered. Its how a company should be run.

    (1) (0)
  19. Kendal Huestis (verified owner)

    I love it, had some start up issues (great customer service and still have a worm gear that isn’t 100% straight( not reported) but it is amazing tool. Would buy it again if needed.

    (0) (0)
  20. Anonymous (verified owner)

    Assembly was very easy, pictures in the guide were extremely helpful. I haven’t got the CNC part producing anything just yet, I’ve been focussing on the laserbeam for the moment. I’ve been commissioned to create a donor wall for our community pool made of laser etched tiles. The laser beam is so efficient that etching one tile takes less time than setting up the next design in lightburn!

    (1) (0)
  21. Scott C. (verified owner)

    Great machine. Working great. Nice machine for a person like myself with 0 CNC experience

    (0) (0)
  22. Tom Koenig (verified owner)

    I had fun assembling it. I had a little prior experience on an itty bitty desktop. I decided to get my SECOND CNC sooner, rather than later. I’m surprised and happy how seamlessly my Longmill does things. One of the parts was damaged in shipment, but they got me the good part right away! I’ve used it to cut out some gift items and am working on some 3d things now.

    (0) (0)
  23. Scott McCrory (verified owner)

    I spent 3 months studying the market for CNC machines in this category and price range and settled on the LM MK2 30×48. 2 months later and I’m very glad I did. I’m writing this in late November 2022, busy making personalized gifts for family, friends and even the office. I took my time with the build, having made a solid table for it while waiting for delivery, then took my time again getting everything level, square, trammed and surfaced. As a result, it’s as rigid, accurate and capable as anything I envision needing. Sienci’s support, documentation, engineering quality and community are top-notch, and I especially appreciate the open source nature of the design.

    (0) (0)
  24. Richard Boes (verified owner)

    Very good machine at a great price

    (0) (0)
  25. John Shipe (verified owner)

    I was very pleased with the assembly instructions, also the help I have received from Jason Kent.

    (0) (0)

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