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. Tim Mohr (verified owner)

    When it works,it works great, which is about 50% of the time

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  2. Sheldon B. (verified owner)

    Absolutely love it. Have used it quite a few times, mostly some basic carvings as it’s my first CNC. I’m getting more used to the settings and programs and playing around with more detailed items. Highly recommend to anyone looking for a CNC.

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  3. Norm H. (verified owner)

    Great machine

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  4. Al Momer (verified owner)

    Thank you for your follow up. I have just finished building and installing my longmill 30″. Along the way I have made notes which I will forward to you soon in regards to some minor assembly problems. (ie: remachining nuts to fit the printed plastic recesses, wording and spelling in instructions, (I can help as well) Also I cant seem to download Gsender. Talk to you later.

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  5. jean-michel Munier (verified owner)


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  6. Michael (verified owner)

    Had 0 experience with cnc work, cad or cam. I am a retired UAW auto assembler. Found the building part of the longmill enjoyable, the online guide was excellent, very descriptive and photos necessary, almost foolproof. Customer service was perfect and easily helped me with the minor issue I came into during assembly. Presently I’m experimenting, I have made a few rectangle family name signs, worked with stacked text, a couple dog silhouettes from a photo and a round sign for a bourbon bar. Most challenges for me is getting the depth for texts different styles. Having fun making sawdust

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  7. Matt Miller (verified owner)


    Thanks for the email and the oppotunity to comment and send feedback. So far I am quite satisfied and having alot of fun with this machine. I recieved Longmill 30 x 30, near the end of November, 2021. The assembly process went fairly smoothly, other than the 3D Z axis gantry mount cracking. But not a big deal, you guys supplied me a new one. I find that your support and online resources are fantastic! During start up I had an issue with one side of Y axis moving way faster than the other. But thanks to your detailed resources/troubleshooting, I found the problem. The torque setting potentiometer for the one servo for Y axis was set to low. Set to same as other Y axis servo or all other servos and then no problem. I was able to get all my projects done that I had planned for as Christmas gifts and more! Then I surfaced the table with 22mm surfacing bit supplied by you guys. But before doing that, I practiced on a piece of MDF. I found that there was about a .004″ step, X axis. After further investigation, I noticed that both cutter edges were not making contact but good on Y axis. So X axis sagging slightly. Loosened everything for X axis to take up any play I could. Helped slightly but not enough. After thinking about it I put thicker washers (.007″ thicker) behind lower X axis vee wheels. This helped signifintely, removing step problem. I imagine your newly designed machine, the MK2 will not have this issue, as it sounds like a more rigid cross rail. I still favoured Y axis and zig zagged with Y to surface table. Came out great! For software, I played with several and found Carbon Create to be the best fit for me. They also have great tutorial vidoes. Lastly, I really like G-sender, easy to use and works great with the Longmill. Well done! The projects I have made are a name letter puzzle for my grandaughter, engraved (v-carved) my wifes favourite scripture on a piece of oak, engraved some aluminum keychains, a one piece horizontal stabalizer for my RC plane. Currently I am working on a scale cutout of a Cessna 150. Last thing you were asking was what experience I have going into this. I am a CNC Service Tech and have been working on CNCs (metal machining CNCs) well, since graduating college in 1990. Thanks!

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  8. David Danboise (verified owner)

    Great machine; great experience; shipped on time; documentation’s (both written and videos) are very clear to understand and follow. The materials of construction are high quality. I assembled my LongMill 30×30 with no issues in about 8 hours.

    I am an advanced woodworker and small engraving business owner. I am a retired mechanical engineer with extensive use of 3D software (SolidWorks). To be honest I had been toying with the idea of building my own CNC Router. There have recently been a number of CNC Router articles in woodworking publications. After I priced the parts I would need I discovered the LongMill was priced similarly. I figured it would take me about a month to build a unit. I would have had to spend countless hours making all the parts to the accuracy needed to have a successful mill. With the LongMill I was ready to start touting in about 2 days. The decision to buy was the correct decision for me. I did my due diligence on the company, read what other owners had to say and watched numerous videos. Again the decision to purchase LongMill was correct.

    I am currently routing signs for my family and business but am rapidly expanding to other carved and machined projects. My customers are most impressed with what I am able to do with this machine. I am planning on purchasing the laser module latter year to further enhance my business and personal family gifts.

    If anyone is sitting on the proverbial fence about purchasing a LongMill, just go ahead and do not wait. The sooner you purchase the sooner you can be productive. Very pleased all around!!!!!!

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