LongMill Benchtop CNC

(91 customer reviews)

From: $1,200.00

The LongMill is currently backordered. The estimated lead time is 8-12 weeks. If you wish to place an order please read the latest update.

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

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SKU: MACHINE015161 Category:


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 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…

  • Hardware, rails, lead screws, and gantries
  • Control box, wires, and motors
  • Instructions (downloadable from our website)

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)*

For routers, we recommend the Makita RT0700/RT0701. It’s a reliable and super powerful router that we’ve been using on our CNC machines for years.

Here are some other compatible routers we recommend:

  • Bosch Colt (some versions may have a slightly larger 72mm diameter which may not be compatible)
  • Dewalt 611

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 a router mount for you. If you do not send us a diameter we will ship you a mount for the Makita RT0700/RT0701 (65mm).

Please note that routers/spindles which are

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

May not be compatible (but we’ll try to make it work)

*Routers that we supply will be 110V only (North America). If you live in a country which 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 and it’s software works on any computer and connects using standard USB. We sell the Vectric VCarve software but it’s not for everyone. Our machine is software agnostic so that you can find what works for you. Everything you need is available for free.

Technical Details:
– Laser cut, 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 3.9 lbs
Dimensions 10 × 8 × 6 in

Weight 1.9 lbs
Dimensions 12 × 8 × 2.875 in

Weight 0.1 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.

91 reviews for LongMill Benchtop CNC

  1. RICKY S. (verified owner)

    So I have had the longmill 30 for a few weeks and have logged about 30 hours of actual machine run time. So far this thing has done everything I have thrown at it and has done things very well. I have had no issues with the machine . Only hiccups have been in the gcode processing but even that was a quick fix in notepad and Chris and Kevin has an article and fix for the UGS issue in the forum. I look forward to many hours of creating on this machine.
    -Machine ordered July 10, 2020

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  2. Mark Strawn (verified owner)

    I really have enjoyed my Longmill. But have been too busy to really use it as much as I would like. In the beginning I admit to being somewhat nervous, but with help from Chris, I managed to work through my fear and actually produce a couple of projects. As I told Chris, customer service in today’s world is a lost art. And I was happy to report that his immediate response to my issues was remarkable.
    -Machine ordered July 8, 2020

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  3. Hector Leiva (verified owner)

    Extremely happy with purchase. Reasonably priced, well built, and easy to assemble. All parts were Color coded and labeled. Assembly instructions were well written and easy to follow. Best packaging I have ever received and I have ordered a lot of items through the mail over the years. Would strongly recommend.
    -Machine ordered July 7, 2020

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  4. John (verified owner)

    Easy to assemble, quality parts and no shortages
    -Machine ordered July 6, 2020

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  5. Steven Koury (verified owner)

    Very pleased so far, as a woodworker with very little computer skills I’m learning a lot.
    -Machine ordered July 5, 2020

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  6. Michael Middleton (verified owner)

    I had no cnc experience before buying the longmill. I watched many videos before deciding this was the best machine for me. I am extremely happy with my purchase! I’ve been running it hard (30 hours a week) and aside from expected general tune ups I have had no problems to speak of! I did run into a couple of hiccups during assembly, but the customer service I received was outstanding. I would reccomend this machine to anyone. Thanks guys! I’m loving the lingmill!
    -Machine ordered July 2, 2020

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  7. David Scheckel (verified owner)

    easy to assemble. easy to adjust, easy to run,. Great experience
    -Machine ordered June 12, 2020

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  8. Ian Fraser (verified owner)

    Sadly the bargain price gets a bit lost in shipping and Duties in Australia. This isn’t Sienci’s fault however if you are buying in Australia budget an extra $1000 to cover shipping and duties.

    The machine is great assembly is pretty easy.
    -Machine ordered July 4, 2020

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  9. Damein Friday (verified owner)

    So far We really enjoyed using the longmill this is our first time using a Cnc so we had a little trouble to start operating the machine so we called and with your great customer service we started to roll and from then we started making things that would normally be a little difficult by hand cutting.We notice sometimes the box would not stay on so we restart if that happens but then it would start Working until it totally stop so I called and emailed the video of the issue and you all shipped out another box the same day and also give me a temporary solution so that I can continue using the cnc untill the new box came in so receive the new box that came with the stop switch and lighting on top when on works great top class customer service will always be a customer and highly recommend Sienci labs
    -Machine ordered July 2, 2020

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  10. Stephanie B. (verified owner)

    First, let me say, I put my LongMill together all by myself and Chris’ videos were extremely helpful (thanks to Covid-19 he had the time – eh!) I’m so happy I went with the LongMill! Sienci Labs make an awesome product! If not for the great price, I would still only be dreaming about having a CNC machine. By the way, your product support is FABULOUS! Hey ladies out there, this machine is for us too!!! I’ve been having fun making test cuts to get familiar with the bits and what they do. I will post something to the forum soon! I LOVE MY LONGMILL!! The only thing that could make it better is a rotary attachment 😉
    -Machine ordered July 1, 2020

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  11. David Streeter (verified owner)

    It’s a good machine. I think at this price point it is an incredible value. Rock solid. great electronics. As always there are tweaks and such you will do but if you’re like me you would tinker with it even if there weren’t
    -Machine ordered June 30, 2020

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  12. Scott (verified owner)

    I can honestly say, This CNC Machine is worth every single penny!! I purchased the LongMill 30X30, and I love it, so far!!
    -Machine ordered June 29, 2020

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  13. Chris Bloom (verified owner)

    Assembly was pretty straightforward. A little bit of a snafu with the wheel sizes Sienci sent being incorrect, but Chris spotted the problem immediately and showed me where to get the wheels I needed.

    All in all, I really love the ability to customize and scalability of the system. So far it works well and is a rock-solid build. Great value for the money!
    -Machine ordered June 29, 2020

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  14. Chris Davidson (verified owner)

    This machine is amazing! The quality is excellent and the design is well thought out. I am super excited to put it to work. I also really appreciated the concise instructions, everything went smooth in putting it together and was easy to understand. The only problem I had with the whole thing was when I connected the side rails to the rollers. I rushed it and didn’t read all the instructions and cracked a roller wheel because I didn’t have it loose enough (as the instructions said to…). I’ll have to buy a new one of those, but other than that everything went together perfectly. It actually even works fine with the cracked roller, but I can get the part easily. It’s an awesome machine at a ridiculously good price.
    -Machine ordered June 25, 2020

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  15. Michael W. (verified owner)

    Great value. A superior product backed up by excellent service.
    -Machine ordered June 26, 2020

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  16. Melvin Turbyfill (verified owner)

    I got the 30 x 30 longmill and it has been a blast learning all about how a CNC works. Putting it together really gave me a good understanding about the machine. I spent more time building the table to put it on than putting the machine together. I think it took me about 8 to 10 hours to assemble. I had a little problem getting the wheels on the tracks and later found out the wheel manufacture had provided wheels that were a little to big. The good folks at Sienci sent new wheels as soon as they were notified of the issue. I have had my CNC since mid July and have used it every day making various types of American Flags which is exactly what I bought the machine for. The machine works like a charm. Yes, I have had my share of errors but so far they have been mostly caused by operator error. I am getting a little better every day. The price for this machine seems to be very reasonable and the customer service has been outstanding. I would definitely recommend this machine to anyone looking to get a CNC.
    -Machine ordered June 26, 2020

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  17. Chris H. (verified owner)

    I didn’t have any CNC experience previous to buying the Long Mill. Assembly documentation was excellent, and assembly went smoothly. The first few projects have gone well and I’ve managed not to break any tooling or components!
    -Machine ordered June 22, 2020

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  18. Christopher P. (verified owner)

    Well worth every penny. Assembly simple with easy to follow instructions and video. Very happy with support from company and community. I “advertise” your product every time I get a chance!
    -Machine ordered June 22, 2020

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  19. Kerry (verified owner)

    My 2nd cnc first was a well recognized hobby unit with belt drive.. I found that a bit of a pain as i use the cnc in sperts separated months amd it seemed to need constant calibration. I’m a luthier so do a lot of inlay work with shell and a lot of work with hardwoods like ebony. I demand a fair bit of accuracy and I find the Longmill provides that.. I also make a number of templates out of 18mm baltic birtch plywood and that machines great with the Longmill. It was easy to assemble and seems very ridgid. Like that I have flexibility with the waste board design and currently have a simple homemade T track one.. Controller seemscgood and is quiet compared to my previous one.. Have to say I am 100% happy thus far..
    -Machine ordered June 16, 2020

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  20. Alan B. (verified owner)

    I bought a little toy CNC On Amazon and quickly decided I needed something real. I was about to buy one of the others on the market when I came across the Longmill by accident. I am sooo glad I did. I bought a 12×30 model that same night. Science shipped it to me in a matter of a few days and I assembled it in about 4 hours. I could have done it much faster but took my time. It has worked So well that I have already ordered to size upgrade kit. Once again Sienci has shipped that in just 1 working day and I can hardly wait to get it later this week. Seriously, I cannot think of a single thing that this company or product has fallen short on. My three words of advice for anyone thinking about a CNC are “Buy a Longmill!”
    You will not be sorry you did.
    -Machine ordered June 16, 2020

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  21. Kevin L. (verified owner)

    I’ve never owened a CNC machine before but i do have experience with lasers and 3D printing. Learning how to create files and such was super simple with all the tutorials on youtube though. It only took me about 4hrs to set the whole thing up minus a small part error due to shipping. As soon as i informed Scienci of this i had the part 2days later. I’ve been cranking out projects since getting this thing running with about 100hrs of cut time i’ve pretty much made my money back making small pieces of furniture, flags and plaques. I completely am satisfied with my purchase to say the least.
    -Machine ordered June 12, 2020

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  22. Gary McLaughlin (verified owner)

    Fantastic product with after sale customer follow ups with some missing parts has been second to none. Thank you and will be buying more in the future.
    -Machine ordered June 10, 2020

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  23. Tom McClure (verified owner)

    Although assembly took longer than I anticipated, it was still relatively simple. Functionally, it does a great job and I am very happy to have it. I would recommend it to others looking for a small CNC router.
    -Machine ordered June 8, 2020

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  24. Adam (verified owner)

    Definitely happy with the Longmill. Does everything I was hoping it would do and any issues I’ve had was just due to lack of experience/thinking
    -Machine ordered June 10, 2020

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  25. William (verified owner)

    Very precisely tooled machine with excellent directions for assembly. I’ve had no previous experience with CNC, but I’m learning the software (Carbide Create and UGSplatform) and I’m having lots of fun in the process.
    -Machine ordered May 20, 2020

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