LongMill Benchtop CNC

(382 customer reviews)

From: $1,200.00

The LongMill MK2 (an updated version of this product) is now available for preorder! Learn more here.

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.

Due to part shortages, some parts, such as the rails and gantries may come with cosmetic defects that do not affect the use or performance of the machine.

This product is discontinued. If you’d like to order a CNC machine from us, please check out the LongMill MK2.

Insufficient stock


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

Weight60 lbs
Dimensions8 × 10 × 41.5 in

12×12, 12×30, 30×30

Weight60 lbs
Dimensions8 × 10 × 40 in

12×12, 12×30, 30×30

Weight0.8 lbs
Dimensions3.8 × 3.6 × 0.8 in
Router Size

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

Weight5 lbs
Dimensions10 × 8 × 6 in

Weight1.9 lbs
Dimensions12 × 8 × 2.875 in

Weight0.354 lbs
Dimensions4 × 6 × 0.5 in

Weight0.3 lbs
Dimensions6 × 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:
ModelLongMill 12×12LongMill 12×30LongMill 30×30
Cutting area307mm 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 area650mm x 610mm (~25.5″ x 24″)1135mm x 610mm (~45″ x 24″)1135mm x 1110mm (~45″ x 44″)
Machine heightAbout 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 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.

382 reviews for LongMill Benchtop CNC

Based on 382 reviews
  1. Anonymous (verified owner)

    I found putting together fairly easy except some parts had changed that were not in video but in pictures which slowed the assembly. I have spent a lot of figuring out which software I will be using. With that, I have not made anything yet. Also building enclosure because I will be running indoors. Kinda wish I had waited for the new updated mill, looks like it will handle metal?
    Thank you,

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  2. Jeremy Nicolaisen (verified owner)

    I love the Long Mill CNC but I wanted to know when the lasers are going to be delivered. I pre ordered it the day i purchased the Long Mill?

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  3. Reto Leuenberger (verified owner)

    I am a newbie to cnc. I ordered the LongMill based on reviews and then finding out that Sienci is local.
    The assembly instructions available on their website were detailed well. The hardware being supplied in separate color coded bags made it very simple to identify. I took my time assembling the unit. Spent a couple hours each night after work. I did not rush it. Made sure that I followed the directions exactly. For Add Ons there are helpful videos. The post processer is easy to use. I haven’t used any other than the Gsender because of it’s simplicity why try anything else?
    During assembly some of the 3D printed parts are very tight to accept the nuts. I shaved down a couple of the nuts to prevent the parts from breaking. I do recommend that Sienci Labs follow up on the quality control of their 3D printed parts.
    The community for the LongMill support is amazing. I recommend joining the group and post questions. Someone is always eager to support.
    My hardest decision was to decide which CAD / CAM programs to use. Multiple free ones available but I did decide to purchase one. I am glad that I did because of the extra features. If cost is an issue then start with the free versions. I am still learning to master the programs but have come along way.
    Practiced with many 2D simplistic cuts to get used to the behavior of the LongMill. I have now done a couple 3D carves. I am very pleased with the LongMill. It is very well constructed. The website is amazing as well. It supplies all the necessary information required from assembly to maintenance. The videos supplied are helpful. In the community forum there are many users that post questions on assembly or set up. All that information is found on the website. I recommend to take the time and make an effort to surf the website. The answers regarding the LongMill are there.
    Overall I am very pleased with the LongMill, and the website. The community support is amazing.
    You can also find helpful videos on YouTube on the LongMill and various programs to run a cnc router.

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  4. Claude M. (verified owner)

    Very easy to set up and use

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  5. michael levine (verified owner)

    I am very pleased with my purchase of the longmill.

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  6. Micah M. (verified owner)

    Very nice design ,with rigidity and performance that exceeded my expectations. I like to build kits ,so I had no issue with the assembly process. Instructions were detailed with pictures and left little room for error. I’ve only cut some practice pieces so far but the machine works very well and so far the only weakness is my lack of experience with CAD/CAM ! Don’t be afraid ,bang for the buck on this machine is off the chart! CNC is amazing and I could watch this machine do it’s thing all day!

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  7. Ernie (verified owner)

    Some of the nuts don’t fit into the holes intended for them.

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  8. Bruce (verified owner)

    Love the Longmill, set up was a breeze when instructions were followed, and received great service when a faulty control box was diagnosed.

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  9. reza k. (verified owner)

    I’m really happy and satisfied with the customer service. There might be some issues with the quality of the material and the lack of some usable sensors, but in general this CNC machine is great and versatile

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  10. Michael Chandler (verified owner)

    Not to happy with the backlash nuts. The machine needs some sort of cross bracing across the x axis at the bottom so when setting up the Y axis rails you know they are properly spaced and there is no binding. A Gage of some sort for checking the Tram.

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  11. Dwayne Iwasuik (verified owner)

    As a newbie to the CNC world and no experience I have found the people to be excellent to work with. My assembly went very well with the exception of putting the drive bearings for the Y axis. The instructions that I followed were wrong.. Other than that I had no problems with the assembly. We ever I have called the staff has been very helpful and sympathetic to any of my questions that I have had. The videos that Garrett Fromme has put out have been very helpful in the explanation of doing certain things like how to do various tasks, and does a very excellent job at what he does and explaining As of yet I have only played around with the different bits and what each one will do. After the Christmas holidays I will be attempting a few different projects. As I get more familiar with my machine everyone at Long Mill has been very supportive with my dumb questions. I want to say Thank You for the support.

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  12. Anderson B. (verified owner)

    Such an awesome machine, been performing as expected, worth every penny paid.

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  13. john kinsman (verified owner)

    After starting with a 3018pro and using Easle the longmill is a huge step forward.

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  14. Doug Wilson (verified owner)

    I HAVE been using a heavily upgraded Marlow 4×8 cnc for a few years now but I was frustrated with the very long machining times when running 3D programs. I purchased the Longmill to alleviate this problem. I made a few Christmas candle holders to practice with then tackled a 3ft wall clock with full inlays for the Roman numerals and the company logo. The pockets were cut on the Maslow and the inlays were cut on the Longmill. I am very happy with the results so far. Assembly of the machine was very quickly achieved ( about 5hrs over 2 days). I HAVE not had any problems that required technical service but parts orders are handled efficiently.

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  15. Eric J. (verified owner)

    I’m really enjoying the CNC experience. I bought a CNC to make a prototype of something I invented and because I like to do a lot of woodworking. The instructions on the website were easy to follow to get setup. I’m still having trouble figuring out drawing in 3D but I think I can cut most anything in 2D and probably 2.5D and I’ve had my machine about a month. However, I’ve only used end mill bits and don’t really understand when or why to use other bits yet. There’s a lot to learn still but I’m able to do what I need to do for now and I’m sure I’ll learn as I go. The Longmill works well and i’d swear it’d be easy to make into a larger format, am wondering why it isn’t offered. I’m cutting something while I’m writing this lol.

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  16. Mark K. (verified owner)

    This machine is awesome I bought it hoping to mill alunium and it does a great job. I have looked at alot of other machines before this one and this is by far the best for your money. The build quality is way better than I was expecting very durable. The costumer service from this company is excellent aswell they had my questions answered very fast. Theres also alot of add ons for this machine.

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  17. Grayson (verified owner)

    Awesome machine! I did break one part when i was assembling it, but they shipped me a new one no charge in a couple days. Great service!

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  18. Patricia M Pilon (verified owner)

    I was new to the CNC world before purchasing the Longmill. Putting it together took awhile but the directions were very straight forward. Customer service has been top notch. I had a small problem and it was dealt with promptly and efficiently.
    I have made several different raised letter signs. Right now I am working on a very intricate vanity project and it’s looking good so far. I have made a couple of boxes, a stacked letter sign and working on mastering inlays. The possibilities are endless and I love it.
    Thank you.
    Dean Pilon

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  19. Thomas T. (verified owner)

    Since getting the machine, things have been going very well. Assembly was easy and straight forward following the instructions. Operation is also straight forward, except for the operator induced errors, which can be frustrating while you go over things to see where you messed up.
    I am enjoying using the Longmill, and look forward to trying more detailed and complex designs.
    Thank you Sienci Labs.

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  20. GREGORY H. (verified owner)

    This is a great machine. I found the overall assembly very straightforward. There were a few instances I had to reread some of the instructions and several photos were taken at too close of a range to understand the orientation. I also had a few 3D printed parts where the nut sockets were too small and I had to Dremel some material away. I have just started cutting and getting familiar w/ the workflow needed. This CNC is a great value for the money.

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  21. Todd McElravy (verified owner)

    Machine assembly is actually very easy and straight forward with the highly detailed directions. As long as you take your time.
    Only issue with assembly was my unit was missing a bag of hardware (esentric nuts). I contacted Sienci and told them of the issue. I had a replacement bag in hand 4 days later. With that being said, Customer Service is spot on from what I have experienced to date.
    I have had my machine now for a bit over a month and am about $350 away from it paying for itself through sales.
    I currently concentrate on making signs, flags and clocks.

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  22. Wayne (verified owner)

    Coming from a MPCNC I am amazed at the rigidity of this machine.

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  23. Eric Struhar (verified owner)

    Awesome, glad I finally took the plunge into the world of cnc

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  24. Ted Keyes (verified owner)

    Easy assembly, rock solid and great customer service.

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  25. Randy (verified owner)

    Very durable! Great machine for the price.

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