LongMill Product zoom


With Size 12×30 For Web zoom


With Size 30×30 For Web zoom


With Size 48×30 For Web zoom


sample machine setup zoom


MK2 Dimensions zoom


LongMill Product
With Size 12×30 For Web
With Size 30×30 For Web
With Size 48×30 For Web
sample machine setup
MK2 Dimensions
Full Screen

LongMill Benchtop CNC MK2

(173 customer reviews)




Due to high demand, LongMills are expected to ship within 5-6 weeks from the time of order.

The LongMill MK2 is a powerful and affordable hobby CNC router perfect for any workshop. Scale it to your needs by choosing from one of its three flavors: 12×30, 30×30, and 48×30.

The machine name roughly corresponds to its cutting area in inches and each machine has 125mm (~4.9″) of Z-axis travel.

Not sure what you need to order for your LongMill? Try our step-by-step LongMill MK2 Configurator!

Shipping is calculated at checkout.


Turn your ideas into a reality with the LongMill Benchtop CNC MK2

The LongMill helps you take your woodworking and fabrication to the next level. Its range of workable materials includes 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.

We designed the LongMill to be the best hobby CNC router in its class, offering rigidity, and reliability. With large extruded aluminum rails, fully supported Y-axes, 1/4″ steel gantries on all axes, high power NEMA 23 motors, and high precision MG-12 type linear guides on the Z-axis, the LongMill MK2 is the most powerful CNC router in its class at its price point.

This kit comes with:

  • All rails, gantries, fasteners, lead screws, and other hardware parts to make a complete LongMill
  • All electronics, including power supply, controller, drivers, and motors
  • Assembly instructions and resources
  • Excellent lifetime technical support during the life of your ownership

Tools and supplies needed for assembly (not included in the kit) are

    • 3/4″ MDF sheet to act as a working surface
    • An electric drill or screwdriver
    • A laptop or computer
    • A router and end mills (for purchase separate on our store)

For routers, we recommend the Makita RT0700/RT0701. It’s reliable, powerful, 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. The LongMill MK2 comes free as standard with a 65mm router mount, which is compatible with the Makita RT0700/RT0701 and most variations of this router design. If you wish to use a different size router or spindle, please check out the other sizes that we offer.

*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. 

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.


Additional information

Weight 60 lbs
Dimensions 8 × 10 × 41 in


For dimensioned drawings all of the machines, please download our PDF document. 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. 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 you to connect your computer to control the machine.


You can include add-ons to improve the functionality of the LongMill. These are all optional. For additional add-ons, please see our Add-On section of our store.

Maktia RT0701 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.

End Mill Starter Set

Our End Mill Starter Set 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

LongMill MK2 Dust Shield

Prevent dust and debris from getting into your Y-axis lead screws with our dust shields designed for the LongMill MK2. Each pair of dust shields are made from formed sheet metal which are easily installed between the front and back feet of your machine using M5 hardware. Please note that the ACME lead screws and Delrin Anti-backlash nuts used on the LongMill are designed to work in dusty conditions and the dust covers are not required for general use. Please note that this dust shield only fits the LongMill MK2 30×30.

Inductive Sensors

Inductive sensors allow users to add homing and limit switch functionality to their machines. We only recommend this kit to advanced users


What materials can it cut?

The LongMill is primarily designed for cutting wood but is capable of cutting foam, plastic, and soft metals such as aluminum and brass.

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.

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.

173 reviews for LongMill Benchtop CNC MK2

  1. Mike Criss (verified owner)

    A great machine so far and top notch service. I noticed a nick in on of the rails and let them know. A couple hours later, I had a new on on the way.
    The instructions and photos were absolutely the best I have come across. Although I have had experience with stepper motors and Arduino boards, this is my first CNC and would definitely buy from Sienci Labs again.

    (0) (0)
  2. Byron J. (verified owner)

    I’m extremely pleased with my Longmill. I had limited experience going with with a Sainsmart 3018 Pro (expanded to 3040) and the difference stepping up to the Longmill has just been amazing. Size, power, and ease of use is simply superior. Assembly and tuning went well – just take your time and all is good. The YouTube resources are also a big help. I’m just a hobbyist, but am having a blast with this tool.

    (0) (0)
  3. Chuck S. (verified owner)

    Good experience so far. Learning curve for sure. But to be expected.

    (0) (0)
  4. Brian (verified owner)

    Works great. There is a lot to learn with the software.

    (0) (0)
  5. Allen W. (verified owner)

    Very nice cnc router. Easy to assemble.

    (0) (0)
  6. Steve Smart (verified owner)

    I did a lot of research before buying and found that I got more for my money with a longmill. Bigger cutting area, better quality of machine, easy to follow instructions and videos.

    (1) (0)
  7. Don Green (verified owner)

    The assembly was easy. I used your tech support a couple of times and they were very helpful. I’ve just made a couple of signs so far. Was amazed at the machine. Haven’t booked up the laser yet. Looking forward to that. Thanks for everything.

    (0) (0)
  8. James Baker (verified owner)

    I paid $1,650 for my machine. I’m satisfied that I have good value at that price. The machine is very rigid and accurate.

    (0) (0)
  9. Marc Landry (verified owner)

    Great machine. Good speed and accuracy

    (0) (0)
  10. Tom Walz (verified owner)

    I love this machine! Very solid, relatively easy assembly and is much bigger than what I had before (3018). Appears to need very little maintenance. Keep it clean and it runs well.

    (0) (0)
  11. Mickey S. (verified owner)

    Great machine. Easy to build and operate. Using gsender and vcarve pro. Quality products that make projects fast.

    (0) (0)
  12. John T. (verified owner)

    Have not really done much so far but everything is working as planned. Assembly was right on, could not have been more exact. I commend you on your instructions, and all components fit PERFECTLY. I have no had much time lately, but slowly getting it done . I am in the process of making my spoil board now. But I did a couple small projects before making spoil board.
    I have a Cnc machine shop (steel and aluminum) so the programming has been easy. I use fusion 360, but bought V-Carve pro, I am learning alot from Brother cnc’er Garrett Fromme. He is priceless as a teacher, actually he is who convinced me to buy a longmill. Your lucky he is on your side. Thank you Garrett. In a nutshell I am 100% happy so far. I hope the experience continues to be great. You all keep up the great work as well, and I am going to be buying some add ons. I highly recommend longmill MK2.

    (0) (0)
  13. William Irvine (verified owner)

    Set up was easy with the instructions. Machine ran good on the first try. I have not made anything yet as I am waiting to get Vcarve.

    (0) (0)
  14. MOSHE FERERA (verified owner)

    Very pleased with the decision to buy Longmill..

    (0) (0)
  15. Dallas S. (verified owner)

    I am band new to the CNC world but have had beginner to moderate design projects in the past. Great so far and learning a lot. Highly recommend the LongMill MK2

    (0) (0)
  16. Roger (verified owner)

    Lots to learn but support is great.

    (0) (0)
  17. Preston K. (verified owner)

    Working well after install. My only hitch was me being dumb and installing a few things backwards. Also – if doing 30×48 mk2 – make sure you use updated docs!

    (0) (0)
  18. Robert Weimer (verified owner)

    I love my Longmill and am excited about learning how to use it.

    (0) (0)
  19. Ron H. (verified owner)

    Unfortunately, I haven’t even opened the boxes yet. We live in Florida and while visiting in Texas my wife had to be hospitalized with an injury. We have been in Texas for about 10 weeks when it was supposed to be 2. She is doing well and we are headed back to Florida tomorrow. One the first things I plan on doing is putting it together. The only thing that I can comment on is the excellent customer service. I have had several contacts and everyone was very helpful. I’ll let you know when everything is up and running.

    (0) (0)
  20. Shane Scott (verified owner)

    Absolutely love the machine, easy to set up, easy to use. Sienci team did a great job with everything. Well worth the investment. Thanks Sienci

    (0) (0)
  21. David ORourke (verified owner)

    Had tough time squaring. Still not sure it’s OK. X Axis extrusion was damaged on 1 end. Threaded screw hole was still intact – Got Lucky . X axis has a point where sound changes and lead screw wobbles a bit more. Still working on getting things setup. (Dust collection then surfacing) Harder than I expected. Thanks, David

    (0) (0)
  22. Charles Gray (verified owner)

    I have set up the CNC and ran a test run, but I have not ran any projects on it. I hope to have time in a week to start playing around with it.

    (0) (0)
  23. Caleb P. (verified owner)

    I’m very impressed with the build quality and performance of this machine. Assembly was well thought out and documented, although the 48″ model instructions could use some attention. Overall I’m very happy with it.

    (0) (0)
  24. Michael Brite (verified owner)

    I am new with the CNC experience. So far, I love this machine. It was relatively easy to assemble. I have been making some items on it and am still learning. I use it with easel software. Would love to buy the laser on down the road and try that as well. The only thing I would do different is maybe include a laminated chart of bits and what they are best at.

    (0) (0)
  25. Jose Rugama (verified owner)

    El precio es increíble

    (0) (0)

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