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. CHRISTOPHER H. (verified owner)

    I LOVE this machine! I only got into the CNC game in May of this year. I started with a 3018 (approx. 12×8 inch work area). When one of the components broke on it, I decided I want an upgrade. I researched for months on all the different machines available and kept coming back to the Sienci Longmill. A comprehensive Youtube Review by Garrett Fromme on the Longmill was the final decision-maker for me. I still cannot believe how much machine this is for the price. The assembly took me a while (about 10 hours), but only because I was being excessively careful and methodical. The assembly instructions are perfectly detailed and easy to follow. One of the 3D printed components was cracked, so I emailed SIENCI and they shipped me a brand new part the next day with no fuss. service is a 10/10 in my experience. Since I got the Longmill last month, I’ve made a bunch of signs, personalized Christmas ornaments, various home decor, serving trays, a large custom rubber stamp, hook boards, etc. It’s so versatile! The only problem I’ve come across is some movement issues on the Y-axis. I quickly figured out it was due to the anti-backlash nut being over-tightened. Loosened it a little and it’s working beautifully again. I really can’t say enough good things about the Longmill. Thank you for being the only company that offers a machine of this caliber at an affordable price.

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  2. Anonymous (verified owner)

    I payed more for my CNC. It was not easy. The video I looked at was old a year old. The company needs to update each time they make a change. I have not gotten it working because it’s not easy. More information is needed for the price paid and support. For the cost it should have cover more of a 5×5 feet range. Yet I would tell people to get a CNC.

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  3. KENNETH (verified owner)

    This machine was super easy to assemble and set-up! I’ve been running it quite a bit and zero issues. Had one issue with an incorrect drag chain part but the customer service was excellent… they sent me a replacement part in two days! I would highly recommend this machine

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  4. Josh Dawkins (verified owner)

    Great machine, easy assembly, easy to use! My only problem was setting up the touch plate, the software is updated I guess so when trying to input the setting or even finding it in the program isn’t the same.. I have yet to use the touch plate because of this but otherwise it’s a great machine!

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  5. Kyle G. (verified owner)

    I LOVE IS cnc!!!! It’s really not that hard to use or put together had a great time.You really learn a lot putting it together.

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  6. ALAN SIX SR (verified owner)


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  7. Kevin F. (verified owner)

    The build was straight forward with the video you put out and the written instruction on line. Garrett from IDC Woodcraft added insight on the build in his videos also. I added the sensor kit to my order working through some bugs in the software, I have high hopes for this tooling.

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  8. Arthur (verified owner)

    A little trouble with putting it together, but overall great service and excellent feedback when you call with a problem. Only made a few signs as it’s a learning curve.

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  9. Brian Wallace (verified owner)

    From simplicity in ordering to delivery ahead of schedule, the LongMill has been a joy to assemble and use. After the obligatory “Sheep” right off the bat, I’ve been porting manual processes over to the LongMill as I move more into incorporating carving into new products.

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  10. Matthew (verified owner)

    I was impressed how fast the machine got here after I ordered it, going from Canada to California quickly. In the process of putting it together I did run into a couple of problems, contacted Longmill and they sent out replacement parts right away. I am loving the machine, ny only drawback was that they didn’t come with the limit switches, but I will be ordering them shortly as they are now a option to get. The speeds at witch this machine runs is amazing. I am glad I went with the 3030.

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  11. Robert Corman (verified owner)

    The new Longmill is like having a 2nd wife, every time one little thing goes wrong it is my fault. When I see she was right all along I love her even more.

    I purchased another cnc machine back in April. The think was junk with a lot of parts. When I saw the video of Chris at a trade show, I took the machine apart and ordered my Longmill. I was able to use the old table, but I sold the junk machine on Craigs List for an $800.00 loss. I was 100% honest with the new owner.

    My advice to someone thing about a new CNC router, Start with the Longmill. I will list a few reasons why.

    The junk machine charged $600. shipping and it took 7 weeks to deliver. (was on a slow boat)

    The Longmill charged $48.00 shipping and I had it in 2 days.

    The junk machine took several days to build, and never worked right.

    The Longmill took one day and was up and running.

    The junk machine had no customer service.

    I need a new coupler for the Longmill. I sent them an email and they sent me two couplers and I got the in 2 days. No charge for the parts or shipping.

    Chris if you make a Longmill larger than 30 by 30 I want one.

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  12. Jesse Coates (verified owner)

    No complaints everything worked exactly as it should and instructions were easy to follow

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  13. james yon (verified owner)

    I had zero cnc experience.. But I love this machine.

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  14. John Rovniak (verified owner)

    Easy assembly. Good quality. Learning a simple way to make complex shapes.

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  15. Roy Mainey (verified owner)

    Great value and a very sturdy machine.

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  16. Thomas G.

    I found the assembly of my long mill easy. The only problem I had was the z mount but were to be heated to go into the 3d printed mount.
    The assembly manual did not specify this.
    I have made several wall plaques for project practice.
    My first real project is a kitty bus in the shape of a school bus that will hold 2 cats. The long mill and vectric software were easy, accurate and flawless in nesting, profiling my parts.
    Except for the absence of limit switches this cnc machine is great.

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  17. Kenneth B. (verified owner)

    So far I love the design. However I am still not able to figure out a program. I have downloaded the g finder, and am having trouble from there.

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  18. Christopher Princing

    I love your customer service. However I am behind the ball and yet to get it assembled.

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  19. David Worrall

    Excellent price

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  20. Michael Roberts (verified owner)

    I bought the Longmill 30×30 and I am very pleased with it. Their were some issues with the learning curve as I was using Easel so I had a lot to learn. Nevertheless, I found the information was very helpful on your website. Compared to many other companies you have an encyclopedic amount of information. Not only on the building of the machine but also for different levels of users, what software to use, and so much more general information on CNC’s. Thank you very much.

    There was the disappointment when I realized that someone had not put the stepper motor couplers in but on Monday when I called (the machine had arrived on Friday afternoon late) the person had already read my missing part email and was ready to send it off. I received the parts the very next day. Service is good and I am not shy to say so.

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  21. David D. (verified owner)

    As a new CNC user I am pleased that this machine can take a beating from my mistakes. Its tough and seems to be ideal for a new learning user as myself or a seasoned advanced user.

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  22. Adam Harston (verified owner)

    Simple design makes it easy to operate and adjust as necessary. Sturdy and precise enough for any need. Great products folks.

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  23. Mike Heller (verified owner)

    I found the last 25% of assembly instructions not quite as good as the first 75%
    One suggestion – after x,y axis are assembled together, screw down one side (only) of the Y axis, then move the X axis rail down to the other end of the Y axis. This allows the installer to ensure the two rails are in exact parallel before securing the remaining Y axis rail. After the 2 rails line up so the the x axis moves flawlessly down the Y axis, screw down the other side of the y axis. NOW install the acme thread and set the screws to secure. This ensures the Y axis travels without resistance.
    I have other suggestions but I will not submit at this time in case you are not interested, I do not wish to waste my time.

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  24. Richard Williams (verified owner)

    I think it’s a great machine.

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  25. Nathan Berry (verified owner)

    Easiest assembly of any machine I have owned. Very strong & ridged rails. Nice & clean control box. Simply the best machine for the money by far.

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