LongMill Benchtop CNC

(310 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

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30 in 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

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.

310 reviews for LongMill Benchtop CNC

Based on 310 reviews
  1. Darien Baker (verified owner)

    Love this machine very much. Thank you sienci

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  2. Laurie I. (verified owner)

    Instructions where so easy to follow.

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  3. Bernard Jeckell (verified owner)

    Sturdy Machine with great support to back it up. Taking the time prior to receiving the Longmill (30×30) to read up on other people’s issues and assembly challenges helped greatly. The online step by step instructions are very helpful. The video version is good but the step by step are way better. I read twice, assembled once and then verified. Everything was in the box it was supposed to be in, the bags were clearly labeled and everything fit together well. I would suggest to include using Loctite BLUE on the threads of most of the gantry parts to help keep things together and then experiment. I am very happy with this purchase and would highly recommend the Sienci products.

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  4. Joy L. (verified owner)

    I absolutely love my LongMill!! I am in my third week of operating it and I’ve already made a few cool things. My favorite thing to make is personalized signs.

    Setup was very straight forward and not near as complicated as I anticipated. The instructions and instructional videos are great.

    I had to contact customer service due to bad threads in a couple of my backlash nuts. Customer service is amazing!! They were very quick to respond and I got my replacement parts within a few days.

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  5. Jason Faber (verified owner)

    This machine has been nothing but fun. The build is tedious but great at the same time because you’re learning the mechanics of the machine which is invaluable, and if your anything like me, you actually LIKE putting things together. Theres a learning curve, but like any hobby you get used to it. The machine feels solid and im sure ill get alot of use out of it for years.

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  6. Jeremy M. (verified owner)

    Machine quality was excellent. Instructions were 95% clear. Customer Service has been excellent with replacing two parts for free. Great price

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  7. Allison D. (verified owner)

    Easy setup with no previous cnc machine experience!

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  8. Clint (verified owner)

    Covid life changing- I am a nurse desperate For an escape – this machine is worth every penny

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  9. Brady G. (verified owner)

    The vwheels are a little cheap but for the price of this machine it is leaps and bounds better than anything in its price bracket

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  10. Ritchie Bedard (verified owner)

    A good value for the machine, including the add on’s. Assembly was easy and straightforward. Watching the Sienci Labs YouTube videos along with assembly manual was more informative. I’ve had no experience with CNC milling, so been learning a lot over the past 2 months, more so after the machine was built. So far I’ve been making small signs and would definitely like to work my way into 3D carves. I learned about the Longmill from a weekly woodworking news letter a friend emailed to me. Only took me 2 days to decide on purchasing. Very happy with my Longmill. I think it’s going to work wonders down the road.

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  11. Anonymous (verified owner)

    I have been wanting a cnc for a few years now but knew I would have to save a long time to get one. and I stumbled upon the longmill and the price made it very appealing. Now I have one. Put it together over a weekend. Was missing some nuts and scienci rushed them too me. Customer service is awesome and they are quicker that most other cnc companies to get the machine shipped. I have to say the Facebook group has been the biggest help from other users. I have to admit I was terrified the first time I used it as I had no experience what so ever with this thing. I broke a bit but that was all. I am so addicted to this machine. I am making so many things mostly for children.

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  12. Larry Coplen (verified owner)

    Purchases a 30×30 on the advice of my cousin who has one. It was an “adventure” assembling the unit, but the online video was very helpful. Fired it up for the first time, and everything worked !. I am still navigating the software chain, trying different cad/cam programs, and the new gsender beta has worked well for me. So far have just done a few simple signs trying different woods, bits, and software. I would highly recommend a Longmill to anyone who is considering a cnc.

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  13. Virgil Houle (verified owner)

    Good not be more happy with it. Took some time to get it together,but it is all I could ask for for the price.

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  14. Mark roache (verified owner)

    machine looks great shipped awesome have not had much of a chance to play with it yet I will update later

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  15. Robert Berg (verified owner)

    Some parts (berings) wore out sooner than I would have expected. Our over all experience has been good. Thanks!

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  16. Peter S. (verified owner)

    Im still having some problems my mill keeps disconnecting part way into jobs not sure how to solve ive used unaversal g code and g sender same thing keeps happening ??

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  17. Travis I. (verified owner)

    On the whole, I’m really enjoying the LongMill 30×30 and honestly wish I’d gotten it sooner.

    I came into it having a lot of 3D printing experience and some reasonable experience with a small 3018 CNC. There is definitely a learning curve for CNC and even with some of the experience I had with the 3018 there’s always more to learn.

    Machine assembly wasn’t hard but there were some things in the docs that were somewhat confusing (which have since been cleared up). There are definitely some things which I’m still less than solid on, like:

    – How tight should those delrin V wheels be? If they can be moved with my fingers at all, the machine vibrates a lot and doesn’t seem tight enough to the rails. The docs seem to conflict on this guidance.
    – How much vibration is OK? I had some issues early on where the machine wasn’t square and vibration signaled that it was going to lock up and be unable to move so I got gun-shy and started slamming on the e-stop with any vibration. However, I’m starting to break out of that habit and just trust the machine… and the vibration does rectify itself. Maybe I just need to lubricate it a bit more?
    – How do I tell how tight the backlash nuts are if I can’t see them? I can’t even get in there with an endoscope camera. The “you have to feel it” guidance doesn’t help if I can’t feel any movement even when the screw isn’t even in the backlash nut.

    Customer service has been good so far. I haven’t really shipped anything internationally so I was caught off-guard by the extra fee. They were very patient with my ignorance and that’s appreciated.

    I have so far been making some signs out of MDF and just running some tests to see how fast I can mill different woods with the power of the larger machine.

    Feeds, speeds, and depth of cut seem to be a real challenge for me and other users – trying to figure out some “tried and true” guidance for it is hard and the same questions pop up a lot in the forums and Facebook group. (A more robust table of values than what’s on the LongMill Resources section would be awesome… or build a calculator into the new gSender?)

    Another thing that seems to stump new users is what software to use. This is, again, a common question that comes up a lot in forums and Facebook. I think the software pages in the LongMill Resources section are good, but maybe some reorg to put the “wizard” at the top or make it more prominently accessible from the main software page would help new folks get going faster.

    All of this is just part of the learning curve, though. The machine itself is great and has been turning out some beautiful results on my work so far. I’m so glad I got it!

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  18. Grant Dares (verified owner)

    I wanted to purchase a Canadian made mill made by a Canadian company. It was definitely the right decision. The machine is top notch, it worked after the build with no real issues and has taken every task I have put it through. I would 100% suggest anyone looking for a mill to seriously consider the Longmill. The quality and cost cannot be beat.

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  19. Stephen Richardson (verified owner)

    I didn’t have any experience with cnc
    prior to buying the Longmill. Talking with Sienci over the phone made my decision easy. I’ve owned it for a year now and couldn’t be happier. Lots of fun and a great addition to my furniture business. I make signs, wall art, and do alot of acrylic carving. Haven’t done any 2.5 d stuff yet but I will. Great for making gifts. The customer service is the best I’ve ever experienced and I feel like I know the guys even though we’ve never met. The best part about the machine assembly was learning so much about the machine. The video made it very easy to put together.

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  20. Tony L. (verified owner)

    The single best investment I’ve ever made.
    -Machine ordered January 27, 2021

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  21. Ron (verified owner)

    Great machine and great service
    -Machine ordered February 3, 2021

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  22. Michel Morin (verified owner)

    I bought the 30 by 30 version, not the small one… I had a good experience but there was parts missing. I had to get a small screw fabricated at the local machine shop to get me by to complete the install. Other than that it was fine.
    -Machine ordered January 29, 2021

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  23. Anonymous (verified owner)

    No prior experience, very easy to use. Assembly took a moderate amount of time but the instructions were very detailed and easy to follow.
    -Machine ordered January 9, 2021

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  24. Ian W. (verified owner)

    Is there a way to incorporate a plug out let in the board and software to shut off the router after its complete running the program
    I’m.on my second set of brushes on my Marita router
    O do run long cnc programs that can run late into the night after I’ve gone to bed
    Other than that fantastic
    -Machine ordered January 28, 2021

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  25. George (verified owner)

    My 12×30 LongMill was easy to assemble with no hitches other than x-axis delrin block alignment was off after mounting on the wasteboard but all works well now after fixing that. I’ve been too busy with other activities to spend much time with the LongMill. Slowly getting it running with Raspberry Pi as controller with bCNC – that took some time to learn also. Now connecting homing switches to hopefully make bCNC more useful. I have zero CNC experience so your guide to software was extremely helpful. I learned and entered g-codes into the bCNC command line along with jogging to create a vacuum hose adapter, by cutting rings of two diameters in a wood block. That was very sweet. I expect to use my LongMill to precisely cut wooden parts for various projects.
    I look forward to your release of gSender for Pi to try instead of bCNC.
    I first saw a LongMill at wood show V-carve seminar so it seems odd a v-bit was not provided with the machine. Your excellent selection of bits led me to order several including the 60 degree v so now ready for any job I decide to run.
    -Machine ordered January 22, 2021

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