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. 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.

    Was this review helpful to you?
  2. Kyle G. (verified owner)

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

    Was this review helpful to you?
  3. 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.

    Was this review helpful to you?
  4. 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.

    Was this review helpful to you?
  5. Richard Williams (verified owner)

    I think it’s a great machine.

    Was this review helpful to you?
  6. 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.

    Was this review helpful to you?
  7. Stephen H. (verified owner)

    Very happy.
    Quite sturdy and rigid.
    Making fancy 2d balusters.
    Using Inkscape and gSender.
    Waiting for limit switches.
    Better than much more expensive CNCs.

    Was this review helpful to you?
  8. Barry J. (verified owner)

    Just got it set up finally, and must say the instructions and pictures make installation a breeze(well done). The limited amount of time I have had it working so far has been first class. The support that is out there for new users is great ,and I commend you for these resources. Completely satisfied

    Was this review helpful to you?
  9. James Drury (verified owner)

    It’s a lot of bang for the buck. Glad I bought it works perfectly, excellent support. Thank you.

    1 out of 1 people found this helpful. Was this review helpful to you?
  10. Lana P. (verified owner)

    Very well built machine, easy to use. The setup and instruction were amazing. We use this everyday for our business Against the Grain outdoors. Can’t wait to see the up and coming CNCs. We use the longmill for custom sign, charcuterie boards and cutting boards. It is also used along with chainsaw carvings and other timber products

    Was this review helpful to you?
  11. Ronald Stiles (verified owner)

    Assembly video & text was pretty much spot on (wih a little bit of common sense thrown in). The learning curve came with Carbide Create. Your G-Code sender is pretty much self explanatory. Thank you for that free software. I have been making medium size projects up to this point. I am still trying to get that warm fuzzy feeling before running files on expensive wood. I have been a woodworker hobbyist for some 40 years but am now ready to put large cabinets and furniture creations in the rear view mirror.
    I have a couple quick questions. Obviously, with some files taking 2 hours or more to run, you can’t hover over the CNC continuously. If something should bind up, is there an override that will stop the stepper motors from overheating? Second question. I have talked to Patrick about getting some set screws for the anti-backlash assembly so I can get maximum range out of the machine. He told me that you stopped sending them because they were loosing up (from your latest supplier) but he would look to find some of the original ones that would not loosen up. Can you tell me where that stands? Third I was very meticulous setting up the Eccentric Nuts for the
    V Wheels. Now that i have run some projects I have found that the V Wheels turn a little harder than originally set. All of them still rotate as the project progresses. Is this something I should worry about.
    Bottom line. I would recommend YOUR CNC to any prospective buyer!!!
    Ron Stiles

    2 out of 2 people found this helpful. Was this review helpful to you?
  12. Malik C. (verified owner)

    Ok update I have done two very small starter projects with this printer and now UGS won’t move the device in any direction. Starting to look like a super expensive paper wait. Not Very Happy

    Was this review helpful to you?
  13. Mike Smith (verified owner)

    I am 71 years old gentleman and I am a right arm below the elbow amputee purchasing this (LongMill 30X30) was a big decision assembly was very easy (follow the instruction sheets and the YouTube video) even for me, the machine works like a charm best investment I ever made (Vcarve pro and gsender) and the service is unbeatable. Patrick (Sienci tech support) helped me on the telephone a few times (3 silly questions) when I ran into issues I couldn’t ask for better support or service especially being a Canadian and purchasing a Canadian product way to go Canada and SIENCI.

    1 out of 1 people found this helpful. Was this review helpful to you?
  14. John Kennard (verified owner)

    I love this machine it works awesome.

    Was this review helpful to you?
  15. Peter R. (verified owner)

    Haven’t had run my first job yet, but the build went well.

    Was this review helpful to you?
  16. Jake Carson (verified owner)

    I have lots of previous woodworking experience but no CNC experience so I’ve been doing plenty of research before purchasing this machine.
    I am very satisfied with my purchase so far. I’m impressed with its speed, accuracy and usability.
    All pros so far!
    Really nitpicking for the cons but;
    -The assembly wasn’t hard but it could have been organized and prepared more specifically for when you need to use it rather than all the parts in general bags.
    I found it slower going back and forth between bags.
    -Limit switches should be a necessity included with the machine, as they are under 1$ and are incredibly important, so you have to outsource those.
    -It should include brushes to clean the rails, etc, it would be a more complete package IMO. Even nail guns come with oil to lube it often, it’s more appealing to me.
    -The top two gears/pulley are exposed for some reason, I think those should come with a clear cover that is magnetic, for protection and maintenance.
    -The probe plate should have more useful info engraved into like the dimensions of usable work space or something, instead of a quote from Lady Gaga…?
    *My biggest complaint:
    -The video content from this company is bad and needs improvement. Some videos are more professional, then some are just a few young guys in a messy unorganized room with no plan and they are jabbering on too long, no edits or cuts, things don’t work, but it’s still in the video, so a lot of wasted time for a lot of people and really making the company look worse and unprofessional unfortunately…
    I would recommend to remove them and redo them, as it has a negative reflection on the company.
    I’m only 27, but when I see sloppy, messy, unorganized, carelessness from a company trying to sell precision cutting machines, I felt embarrassed and that really made me feel like I should not have purchased anything from this company but I already had… :/
    It’s clear to me now that the company is run by younger people. Even their website pages and manuals are littered with grammar mistakes and spelling errors.
    Fortunately there is enough content from other people who took their time and are clear and informative to help you learn and understand so I just avoid this company’s videos altogether and save my time.
    Just my thoughts.
    All those cons have easy quick solutions, even can be done at home, so they really aren’t bad.
    The Machine is solid though, and I’m loving it!
    I would recommend to a friend.

    3 out of 3 people found this helpful. Was this review helpful to you?
  17. Michael B. (verified owner)

    I have had experience programming cncs in the past for steel cutting.
    The assembly of the machine was good although it took longer than expected. Probably about 12 hours.
    I had a couple of issues but the online community had already dealt with these issues.
    I am cutting mainly signs and name plates…hope to do more soon!

    1 out of 1 people found this helpful. Was this review helpful to you?
  18. pascal charbonneau (verified owner)

    Wow simple and very machine ! Tk

    Was this review helpful to you?
  19. Michael Gaffney (verified owner)

    Easy to set up. As long as you follow instructions. The guys at Sienci are very approachable and helpful. I’ve had no issues with machine . The few I have seen online have been solved and dealt with very quickly. I would say amazing customer service. Machine is well thought out. I would recommend people to do lots of research and even try getting to grips before purchasing. My problem where all because I wasn’t familiar with software and design. However the guys at sienci and the guys on the Facebook users page have been a constant help. This gave me the boost and confidence to continue when I was losing hope. Personally I am planing on upgrading to the larger model when it’s available. Also with it being made in Canada, it’s as close to buying local for a CNC as I’m likely to find.

    Was this review helpful to you?
  20. Paul T. (verified owner)

    The purchase of my Longmill 30X30 has been a wonderful experience right from the beginning. I am very impressed with the online tutorials, from setup to maintenance, and I am just starting to explore the best software to acheive the project results I am looking for. I am a big Sienci fan!

    Was this review helpful to you?
  21. Tim Smith (verified owner)

    Works super very, easy to use, made lots of signs with it so far

    Was this review helpful to you?
  22. Paul Stala (verified owner)

    Have not had a chance to setup yet had hand surgery then covid just now getting over it but hand is issue right now. I know I will have fun with it.

    Was this review helpful to you?
  23. charles pierson (verified owner)


    Was this review helpful to you?
  24. Lawrence M. (verified owner)

    Budget friendly wven for the super small shop

    Was this review helpful to you?
  25. Michael Lavoy (verified owner)

    I have found your machine a enjoyable experience I have made over 1000 projects in the month I would like to share with you my engineering I have done.

    Thank you
    Michael laVoy

    Was this review helpful to you?

Only logged in customers who have purchased this product may leave a review.