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LongMill Benchtop CNC MK2

(341 customer reviews)




LongMills are expected to ship within 1-3 days from the time of order. Each machine is made to order.

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
  • 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.

Maktia RT0701 Router

We recommend using the Makita RT0700/RT0701 router 110V with your LongMill. 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.

341 reviews for LongMill Benchtop CNC MK2

  1. Wayne Zint (verified owner)

    My experience with my Longmillmk2 has been challenging. As a 70 yr old person taking on this machine is quite rewarding. Although I’m not the smartest cracker in the package, I’m learning something every day. I’ve had my longmill set up for several weeks but haven’t put to operation yet. I’ve been doing lots of youtube tutorials and trying to soak up the basics so I can get started. Learning to use the software is quite a challenge. I use Garrett Fromme tutorials alot which he goes into extensive details. You guys along with vetric tutorials are great too. The challenges are out there, and if I can do it, so can anyone else. Chris i appreciate your extensive help in showing us all how to assemble the machine. To all of you at Sienci Labs, Thanks again!! , Wayne (Amarillo Texas)

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  2. Raymond Learning (verified owner)

    great machine well built and very sturdy.

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  3. dean berg (verified owner)

    Went together with any problems. Made a couple signs for the Grandkids as practice.

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  4. Robert S. (verified owner)

    Absolutely loving this machine so far. Assembly was a breeze thanks to well written instructions and a multitude of videos. A very sturdy machine thanks to quality components. Lots of videos on getting started as well. I am thrilled with my purchase.

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  5. Maxime B. (verified owner)

    Great machine, easy to setup and plenty stiff. Once you learn the CAD/CAM software, there’s nothing stopping you from making amazing projects.

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  6. Lowell Weeks (verified owner)

    Love my LongMill 30X30!

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  7. Jeff Penkwitz (verified owner)

    I think it’s a very nice machine . Customer service was great. Assembly instructions could be a little more friendlier for the large 50 inch long mill. Still learning have made some trays picture frame stands and small boxes with covers. Baby steps…

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  8. Terry R. (verified owner)

    Amazing design, works like a charm and you can’t bet the price. Online community is great, this is one company to watch out for. Online assembly videos and manual were spot on, so far I used the machine for some laser engraved cutting boards, 3D relief carvings and a couple of signs. I would highly recommend this machine to anyone.

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  9. Scott (verified owner)

    I did the assembly over a few days, purposely. I did this so I wouldn’t feel overwhelmed right off.

    I was surprisingly intimidated at first, but after reviewing some YouTube videos, I was going non-stop.

    So far, I haven’t had any problems that I couldn’t solve or realized what I did wrong that ended up with the outcome that I did.

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  10. Richard V. (verified owner)

    Mine is actually the 48X30 @ 2300 CAD
    Having no experience at all with CNCs it was a big learning curve. The videos on you tube and your website helped a lot. After many hours of watching software tutorials and then the assembly video things went pretty good.
    With limited space I had to design a tilting table to reduce the machines footprint when not in use. Table complete it was time to mount the Longmill Mk2. The process went very well.
    I had gone into gSender and made some some adjustments to the software that a video had recommended and that gave me some trouble connecting the computer to the machine. Resetting to the defaults solved that.
    The computer and Longmill were now talking to each other but were speaking different languages. I went on to the forum and got help with this problem. I had set everything to inches, but the longboard speaks metric, so my 6″ first cut was 6mm instead of 6″. Once the setting for the saved files was set to metric everything worked just fine.
    I have only made 2 things and they are both in foam so I get all the bugs out (like remembering to turn on the router). My next project will be in wood.
    I highly recommend the Longmill Mk 2.

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  11. Raul Garcia (verified owner)

    Overall I’m happy. All of the issues I’ve had have been resloved by the community. There are still some things id like changed. I wish there was better support for wireless controlerl usage. In order to get my controller to work i had to shut off soft limits which I really like having on. Also, when my controller shuts off from idling, and when I turn it back on it won’t auto connect to gsender. I don’t find these things to be deal breakers. Im happy overall. I am excited to see where the rotary axis will take my machine, and also the super board.

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  12. Anonymous (verified owner)

    So far this machine proved to be easy to assemble and calibrate. I have surfaced the spoil board now I am looking to start my first project this week!!!!!!!!

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  13. Joseph Vitale (verified owner)

    I was a hobbyist woodworker with about 5 years of experience doing wood projects but no experience with CNC machines. I have a tech background in computers which helps but no experience in design etc, I like the machine. It went together fairly easily. I followed Chris’s videos as I set it up pausing them as needed. O made some careless mistakes but thanks to support was able to fix them and complete the setup. Your support is very responsive they always respond quickly which is important when you need help before you can progress. To date due to personal delays, I only completed the fun projects that had existing gcode for downloading. I am looking forward to creating some of my own projects as I learn the Vcarve Desktop software. Over I like the and the company and the Longmill you make customers feel like an important part of the organization

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  14. Gary Regis (verified owner)

    Greatly enjoying the Mk2 LongMill router.
    The steps to assemble the unit was good. The only problem I had was setting up the track wheels on the Y axis. A bit of a learning curve using the Vetrics software but using YouTube videos has helped greatly on using this software. Overall great machine, price and support.

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  15. Ron Shepherd (verified owner)

    This is a truly amazing machine. It’s built like a Sherman tank. By assembling the Mark 2 myself, maintenance is a breeze. I know every part of this piece of equipment. And even my wife loves it. I no longer stumble around the house looking for something to do. Actually, I haven’t seen my wife in weeks. I enjoy most, designing funny signs. The best money I’ve ever spent. Thank you Sienci.

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  16. Muhammet Ozkalkanli (verified owner)

    I’m a custom tile designer. I was getting my models with 3d resin printer before production. But resin printer has limited print dimensions so i wanted to switch to CNC machines. I did not know anything about CNC machines before. After i found Sienci Labs, i wanted to give it a try with 30×30 mk2. After watching their videos and great community channels, assembly was so easy and fast. I had problem with one of Y lead screw. Customer service was helpful and they sent me immediately new one. Their GSender software is easy to understand and use. As a beginner cnc user, result is great. For tiles i need precise dimensions and i get always great models with my mk2. Definitely i recommend this cnc. You won’t regret. Thank you Siensi Lab.

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  17. Brad (verified owner)

    Solid machine! Great build instructions which helped in getting up and running quickly with confidence.

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  18. Rick M. (verified owner)

    Assembly went very well. The online instructions were easy to follow. I was a CNC programmer for 3,4 and 5 axis machines before retiring 6 years ago. I have been making signs, crosses and anything else I can think of.

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  19. David Taylor (verified owner)

    I am brand new to CNC machining, the instructions were very clear for how to set up. Very well done!

    I had an issue a couple weeks back where the machine would randomly stop and I sent a message to customer service, they sent me some ideas to fix this and I haven’t had any problems since.

    The only thing I would recommend is making the anti-backlash bolt on the horizontal axis (behind the router) easier to screw in, right now is is very difficult to adjust this.

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  20. Blake Farren (verified owner)

    Assembly straightforward.. Performance is great. Increasing complexity of projects going well. Thanks

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  21. Ronald Haynes (verified owner)

    Very happy with the machine itself so far. I put some stuff together incorrectly but that was ME not reading the directions carefully enough. My biggest issues have been the design software (Carveco for now), learning it, figuring out how to use it, learning HOW to ask the right questions in Facebook groups, trying to comprehend feeds, speeds, plunge rates, chiploads, etc. I’ve made a few things so far and I learn more on every project. But my expectations were that it would be a lot easier. Again, that’s on ME. The Longmill does everything it is supposed to do and once it’s been adjusted properly, it is fascinating to watch it work.

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  22. William Pare (verified owner)

    Assembly was a breeze.took me about 5hours taking my time . Going step by step .still learning the software but is is going good.

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  23. Brandy H. (verified owner)

    Lots of tweaking and assembly but finally got it up and running now to learn more

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  24. Robert DeHart (verified owner)

    Can not say anything but good, with the on line install information , made it full proof, straight forward install no problems, unit works great a little bit of a learning curve with the software but with Gsender made it easy to run programs on the Long mill. Highly satisfied

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  25. Stanley S. (verified owner)

    I bought a cnc laser about a year ago and fell in love! I knew I had to have a cnc router. After some convincing of the wife I got my order in. I did a lot of research and thought the Longmill would be the best bang for the buck. I was right for once!. This is an incredible machine! I have been a mechanic for 30yrs, So it took me 4hrs to get it up and running and it has rarely stopped since. To any one getting into cnc I would truly recommend the Longmill!. Get the software you plan on using first and get use to it, It helps a lot. Thank everyone at Longmill, Great product!!

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