LongMill Benchtop CNC

(324 customer reviews)

From: $1,200.00

The LongMill is a powerful and affordable hobby CNC router perfect for any workshop.

Scale it to your needs by choosing from one of it’s three flavours: 12×12, 12×30, and 30×30.

The machine name roughly corresponds to its cutting area in inches and each machine has 113mm (~4.4″) of Z-axis travel.

What sets the LongMill apart:

  • Simple and reliable design ➜ angle-aluminum plus thick steel gantries makes for a rigid and dependable machine
  • Lead screw driven on all axes
  • Mounts directly to any surface you wish ➜ freedom to integrate clamps or custom jigs that suit your work style
  • Tall cutting height ➜ don’t be limited when you want to cut large, intricate 3D surfaces or flatten large lumber slabs
  • Proudly made in Canada

Shipping is calculated at checkout.

Orders placed today will ship in 2-3 weeks.


Turn your ideas into a reality with the LongMill Benchtop CNC

The LongMill helps you take your woodworking and fabrication to the next level. Its range of workable materials include: 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. Make signs, engravings, mid-size furniture, stands and shelves, wooden toys and games, guitar bodies, and much more! (see more in our Gallery)

We offer our machine because CNC technology opens up a whole new world of making capabilities, especially to those who have a limited shop environment or budget. Our goal is to empower you by giving you access to both a machine that’s capable of a wide range of projects, and by assuring you of the assistance that you’ll receive from our team as well as our ever-growing community of machine owners: many of whom started off green to the world of CNC as well but are now happy to share what they’ve learned along the way. (see our Facebook group and Forum). We provide a complete set of resources and instructions to get you on your way to running your first job on your machine.

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

Every kit comes with all the…

Assembly only takes a few hours and can be done with a set of wrenches, Allen keys, and a flat head screwdriver. There is absolutely no soldering. We’ve spent thousands of hours designing and testing the LongMill to ensure that this machine is easy to put together. If you can put together IKEA furniture, then putting together the LongMill will be a breeze.

What do you provide?

  • Your own wasteboard/spoilboard (found at your local hardware store), this is the surface that you’ll be mounting your machine to. See the ‘Size’ tab above for more info.
  • A router (purchase one from us, use one you already have, or find one at your local hardware store/online)*
  • Tools to assemble the machine (wrenches, Allen keys, flat head screwdriver)

For routers, we recommend the Makita RT0700/RT0701. It’s reliable, powerful, is 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.

There are some other compatible trim routers on the market that you could use – bear in mind we haven’t tested any of these in-depth:

  • Dewalt DWP611 (uses 71mm mount)
  • Carbide 3D Compact Router (uses 65mm mount)
  • Avid Power MW104 (uses 65mm mount)
  • MLCS Rocky 30 9056 (uses 65mm mount)
  • Ridgid R2401 (needs to adapt from 61mm to our 80mm mount to clear it’s ~6x15mm protruding body notch)
  • Bosch Colt PR20EVS (uses 71mm mount but sits much higher up than normal, you’ll have to space up your material)
  • Bosch Colt GKF125 (needs to adapt from 72mm to our 80mm mount, also sits much higher up than normal)

The LongMill can accommodate bore sizes of 52, 65, 71, and 80mm,  Don’t see your router listed? Let us know the diameter of your router so that we can make an adapter. 

Please note that routers/spindles which are…

  • Over 2.7kg/6lbs
  • Wider than 80mm/3″

…may not be compatible. Please message us with your router size if you have a router that isn’t listed.

*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. LongMills will come with a power supply that supports both 110V and 220V.

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.

Technical Details:
– Laser cut, 1/4″ steel gantry plates for high rigidity
– Standard profile, extruded aluminum rails on the X and Y axis and MGN12 linear guides on Z axis
– Delrin V wheels with variable eccentric nuts
– 4-start, 2mm pitch, 8mm diameter ACME lead screw for high torque and fast movement
– NEMA 23 stepper motors on all axis
– 3D printed and aluminum parts
– Mount for Makita RT0701C routers, or request a custom mount size
– 24V power supply
– Arduino board loaded with GRBL firmware
– 4A TB6600 drivers

Our machine uses open-source hardware and firmware, letting users build and modify their machines. Not only that, many of our components are standard and easy to source or 3D printable, making replacing parts easy.

Additional information

Weight 60 lbs
Dimensions 8 × 10 × 41.5 in

12×12, 12×30, 30×30

Weight 60 lbs
Dimensions 8 × 10 × 40 in

12×12, 12×30, 30×30

Weight 0.8 lbs
Dimensions 3.8 × 3.6 × 0.8 in
Router Size

52mm, 65mm (Makita Router), 71mm, 80mm

Weight 5 lbs
Dimensions 10 × 8 × 6 in

Weight 1.9 lbs
Dimensions 12 × 8 × 2.875 in

Weight 0.354 lbs
Dimensions 4 × 6 × 0.5 in

Weight 0.3 lbs
Dimensions 6 × 4 × 1 in


Once assembled, each model of the LongMill (12×12, 12×30, and 30×30) is designed to generally fit on a 2×2′, 2×4′, and 4×4′ surface respectively. The diagrams below show a more detailed view for each model:
  • The red area inside the main box shows the cutting area as an offset from the foot base. It’s based off the center-point of the router, thus you can plane an area larger than what’s stated if you’re using a large surfacing bit.
  • The blue area outside the main box shows the hanging parts as an offset from the foot base which makes up the total machine outline.
  • If you have the dust shoe attachment in place, it’ll reduce your cutting travel in the X-dimension by approximately 50mm.
At the end of the day, this leaves you with:
Model LongMill 12×12 LongMill 12×30 LongMill 30×30
Cutting area 307mm x 345mm (~12″ x 13.5″) 792mm x 345mm (~31″ x 13.5″) 792mm x 845mm (~31″ x 33″)
Max stock width (distance between feet) 435mm (~17″) 920mm (~36″) 920mm (~36″)
Machine area 650mm x 610mm (~25.5″ x 24″) 1135mm x 610mm (~45″ x 24″) 1135mm x 1110mm (~45″ x 44″)
Machine height About 14″, but if you’re planning to build an enclosure you should make it at least 20″ tall to ensure enough space for hose management, manipulating cutting material, etc.
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 for you to connect your computer to control the machine. By default the clearance height under the X-axis rail is 104mm (~4″) so if you’d like to take advantage of the full 113mm (~4.5″) of Z-axis travel that the LongMill has to offer, the feet can be spaced up by two strips of material on each side to gain more height clearance. 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


You can include add-ons to improve the functionality of the LongMill. These are all optional.

Trim 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.

Bit Starter kit

Our End Mill Starter Pack comes with a basic set of end mills to get your started for many projects you might have in mind. Each pack comes with:
  • 1/4″ Spiral Up Cut End Mill
  • 1/4″ Spiral Down Cut End Mill
  • 1/8″ Flat End Mill (x3)
  • 1/8″ Ballnose End Mill (x3)
  • 1/4″ to 1/8″ Collet Adapter


What materials can it cut?

The LongMill can cut materials like wood, plastic, foam, and soft metals. We’ve also had customer cut tougher materials like thin stainless steel and copper sheet.

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.

Can I add end stops?

Although end stops are not needed on this machine, they can be added. Our electronics support end stops and is easy to integrate.

We’ll have more details on adding end stops soon.

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’s received.

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, or intentionally causes damage to the Product.

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.

324 reviews for LongMill Benchtop CNC

Based on 324 reviews
  1. Kathy Wilt (verified owner)

    One of the best purchases I’ve made. More than fair price. Customer support is second to none. The folks in the Sienci community have been so helpful. I’ve never used a CNC before this purchase and i love it. Now to figure out some of the more complicated software out there so i can do a little more. Thank you
    -Machine ordered Feb 12, 2020

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  2. jez gariepy (verified owner)

    Overall I’ve been very happy with my Longmill and the setup experience. The step by step video tutorials on YouTube was a great help. I would recommend for those using a Bosch Colt as a spindle to set up the mounting bracket at the lower position to maintain as much vertical range as possible, I’ve actually had to raise my spoil board to reach it with the kit 1/8″ end-mills. This is my first CNC machine and the learning curve has been steep but fun. I’ve encountered some accuracy issues but I think it might have more to do with my feeds and speeds than the machine its self. I guess time and experience will be the judge of that. Big thanks to the whole team at Sienci Labs, I’m proud to have the option to run quality Canadian made machine.
    -Machine ordered Jan 6, 2020

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  3. Anonymous (verified owner)

    Haven’t used it much yet but looking forward to using it for our business. Thank you.

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  4. Matt B. (verified owner)

    The machine is wonderful I’m very happy with the performance, especially for the price. I’m new to CNC and it was easy to get set up and start cutting. Had a slight electrical issue which was diagnosed and dealt with by the Sienci team very quickly. Would highly recommend the LongMill.
    -Machine ordered Apr 25, 2020

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  5. Emilio Garza (verified owner)

    price was within my budget. ups deliver fee was a surprise.
    -Machine ordered Apr 27, 2020

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  6. Dwayne (verified owner)

    I researched a few models before deciding on the LongMill and I found the construction of the LongMill to be superior to the other brands I researched. It uses a basic construction method with heavy duty parts making the machine reliable and sturdy.

    Machine assembly was a breeze after I watched the step by step videos that Sienci created.

    When I did have an issue with one of the potentiometers (controls the force when driving the motors), Sience was quick to ship me a new control box with a pre-paid label to ship the old one back. Great customer service and great company to deal with.

    Now that I have a CNC, I’m using it a lot more than I anticipated. It’s amazing how many projects come to life when you add a tool like this to the shop.
    -Machine ordered Dec 1, 2019

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  7. Jeff Willis (verified owner)

    It’s been great. I have had great success producing some real nice items.
    -Machine ordered Feb 7, 2020

    1 out of 1 people found this helpful. Was this review helpful to you?
  8. wayne j. (verified owner)

    so far I have liked everything about the cnc machine just need more time to work with it
    -Machine ordered Nov 12, 2019

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  9. Brad H. (verified owner)

    I found the Long Mill well built and thought out. The customer service is above and beyond great. They answer you questions and help you fix any issues. I can’t be more happy with this purchase.
    -Machine ordered Dec 4, 2019

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  10. Joseph Wilson (verified owner)

    Overall, I love the Sienci Labs 30×30 LongMill CNC! The setup took me a full week to complete by doing a little more each day. I also had to build a bench for it to sit on which took a few more hours. The bench setup was expected. LongMill setup was tedious but thankfully Chris had very detailed videos on YouTube to help me through the process. The other challenging part is figuring out which CADCAM software to use. I found this quite frustrating as there are so many and most have a major learning curve. I settled on Easel which did come with a subscription price but allowed me to focus more on the creative side of having a CNC and less on figuring out complex software. I would recommend the LongMill to friends for sure and feel it’s a solid product with solid construction.
    -Machine ordered Feb 11, 2020

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  11. Ron (verified owner)

    Hardware and installation was good. Software instruction was spotty. Could not get the probe to work. Ron
    -Machine ordered Mar 18, 2020

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  12. Ken

    I knew when I ordered the cnc that it would take a few months. At first there was very little info on where my order was “ in the list”. About Nov. there was more info coming out and it gave me a better time line. By mid Dec. the info on machines completed was much better and I now had a pretty good access net of when my order would be filled. In all I was pleased with the communication that was on your feeds
    -Machine ordered Oct 15, 2019

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  13. Gabriel (verified owner)

    Awesome machine at an affordable price point!
    -Machine ordered Feb 9, 2020

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  14. John O’Hara (verified owner)

    My only problem is finding software that is usable and understandable for me.
    Longmill runs great.
    -Machine ordered Dec 7, 2019

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  15. Keith Murray (verified owner)

    I have had my Lomgmill for about a month now. It took about six hrs to assemble. The instructions were clear and the parts were all of good quality. Customer service is good and it is a treat to be dealing with fellow Canadians on a purchase! Currently I am using all one source software which is meeting current needs. Without hitting the $10000 price range, I don’t think there is a real competitor to this unit.
    -Machine ordered Mar 22, 2020

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  16. Andrey G. (verified owner)

    As a new person to cnc machining, I was impressed with design of the LongMill 30×30. It looks solid(although, I personally would use metal on front and back rails holders).
    Assembly is clear and straightforward especially with video instructions provided.
    It would be unfair to not mentioned great customer support. I had a small issue with locking nut. It took me one email and guys send me a replacement part.
    Lastly, I can not describe the feeling when you can convert some drawings on computer to extremely detailed and precise, material part. I am having a blast! Thank you ScienciLab!
    -Machine ordered Mar 22, 2020

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  17. Chris Bennett (verified owner)

    I’m extremely happy with my longmill. I bought it never having used a cnc before and was amazed at how easy it’s been to learn. I’m still learning every day but right away was able to create basic signs and begin having fun. The assembly took about 6 hours but the instructions were very easy to follow and the time flew by. The few times I’ve been stuck both Chris and Andy have been very fast to respond and have sorted out any issues there have been. I’m now onto carving 3d stl files and the machine is doing such a great job. I also just added a 7w laser to the front and for anyone buying a jtech laser the open build kit is the one that’s compatible with the longmill. I have referred many people and will continue to do so you guys are amazing and your product is truly excellent. Thank you
    -Machine ordered Nov 11, 2019

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  18. Ryan Campbell (verified owner)

    I would recommend this unit to any hobbyist looking to start with CNCing. It has been a VERY large learning curve for me as I just dove in head first, but the Sienci team has been willing to answer every and all calls I have made. The setup was long, but very worthwhile and easy to follow with the online videos/instructions. Furthermore, the forums have been very helpful as well. For me the machine itself has performed nicely, but I have only made a few signs in some simple barnboard/pine.
    -Machine ordered Apr 15, 2020

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  19. Aaron Smith (verified owner)

    As I a first time CNC owner and small business owner I would like express my thanks to the Sienci Lab Team. The 30×30 Long Mill has met my expectations and more. It is like a second pair of hands in my shop allowing my to increase my output for customer demand….by following Chris’s You Tube instructional for assembly I was able to easily put my machine together. All the while gaining a knowledge of the intricate pieces and how they work….something you don’t get from a pre assembled machine. Design and creation was just as easy by following Andy’s You Tube tutorials which are all found on the Sienci Labs, You Tube page……they really left no stone unturned. All the information you need is available via their website from settings to FAQ. The Longmill Community continues to grow and everyone is there to help one another if you have an issue normally the responses are immediate…..Thank You Sienci Labs Team you guys are truly amazing and so is your product.

    Aaron Smith
    -Machine ordered Feb 28, 2020

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  20. Justin Bouchard (verified owner)

    As an entry machine that is WAY cheaper then anything else out there I can say that i am very happy with my purchase. Its simple – very little to go wrong with it and the service from the fellow Canadians have been top notch.

    The only issue I had was not following the instructions very well. I forgot to put a washer on a bolt and it made the delvin wheels break on me. BUT thats on me. Seeing how its a precision machine you can’t really take any shortcuts on the set up!

    Another piece of advice is making your table before hand – make it bigger then you need it to be and make room for that control box.
    -Machine ordered Feb 23, 2020

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  21. Mike McCracken (verified owner)

    Decent machine for the price , Had one small issue and it was resolved instantly ,the customer service and knowledge is second to none.Would not hesitate to recommend this company to a friend or purchase their next new product.
    -Machine ordered Apr 24, 2020

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  22. Steve McGinnis (verified owner)

    Awesome machine!
    -Machine ordered Apr 23, 2020

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  23. derek v. (verified owner)

    Solid machine. Customer service second to none. Great place to start and grow cnc experience. Can’t wait to see what the future holds for Sienci Labs
    -Machine ordered May 1, 2020

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  24. Blair H. (verified owner)

    Solidly built, easy enough to assemble, excellent customer support…all at a great price.
    -Machine ordered May 1, 2020

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  25. Luc T. (verified owner)

    Good price for a Canadian made product.
    -Machine ordered May 4, 2020

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