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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
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LongMill Benchtop CNC MK2

(133 customer reviews)


Built to order… ships within 3 to 4 weeks from 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.

133 reviews for LongMill Benchtop CNC MK2

Based on 133 reviews
  1. Kenny Blake H. (verified owner)

    Great machine! I have done several projects since I bought the LongMil. I think one thing that I would add to the package is a small tube of the lubricant for the Z axis rails. I would like to buy some if there is availability.

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  2. Anonymous (verified owner)

    I love it. Really has sped up my workflow.

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  3. John B. (verified owner)

    I had inherited a Bob’s E4 from my brother-in-law, so that was my entry into CNC woodworking. It was good for learning but I found it was not robust enough or quite big enough for what I wanted to do. Enter the Longmill MK2! Wow! Talk about a solid machine at a great price point. It arrived safe and sound in about 10 days (remote BC city). No damage during shipping, well packed, and nothing missing – in fact plenty of extra parts. Online instructions and videos were excellent, my only issue was orienting the drag chain “anchors” properly, but figure that out pretty quickly. Just finishing my waste board/t-track assembly, then it’s time to build some things that friends have commissioned. Very impressed with my investment. Thanks Sienci Labs – you have exceeded my expectations and my customers will know what a great machine you produce. So great to buy Canadian too!

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  4. David Savoy (verified owner)

    Great unit easy to set up and use

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  5. William Covell (verified owner)

    I keep telling myself, it’s not the machine making the mistakes, IT’S YOU, DUMBASS!
    Still a newbie and the machine is solid. Not to worry, I can’t do any harm.
    Just now I’m installing the probe and the 3 whatchamacallit thingy things.
    Standby for more information soon.

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  6. Owen Jurgens (verified owner)

    The machine is fantastic. We downloaded the V Carve Pro software and this was a tremendous help in getting to know thw machine. We also have a guy at work that works our SMD Electronics machine which has helped me a lot. On V Carve there are many vidioes as to how to get the design ready to download onto the machine. It is expensive but very well worth while. The desing of the machine is ingenious and putting it together was a dream. As easy as anything. Service was good. We are doing some carvings from the Clipart from V Carve at present

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  7. Albert T. (verified owner)

    Paired with a Makita router this CNC is a beast for its low cost. Excellent value in its class. I recommend it to anyone that asks what I use.

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  8. Scott Fischer (verified owner)

    Great quality and assembly videos were detailed and easy to follow

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  9. victor p. (verified owner)

    For someone with not alot of knowledge about cnc i would recommend it for any beginner hobbyists trying to start their cnc journey. The assembly took a couple hours but the instructions were very detailed and easy to understand, making the assembly process less stressful. 5/5 rating definitely recommend for anyone wanting to get into cnc!

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  10. Marcel Gagne (verified owner)

    Very please with this machine

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  11. James Angell (verified owner)

    I worked with CNC machines before retiring 20 years ago. I purchased a small Chinese made machine a few years ago. This gave me knowledge as to what features I would want to have in a new, bigger machine. I watched Youtube on CNC machines and videos and discovered your machine. Also I found the videos that Garrett Fromme presented. These videos were most helpful and he is a good instructor.
    Before starting assembly, I downloaded the assembly manual and watched the videos that you have. By watching these videos, the assembly was straightforward.
    I have not had to use customer service so far but I have every confidence that the customer service will be as good as the machine.
    If I could make a suggestion, I would add a couple features to G-sender. (1) I would make the console window larger so that you could have more lines of G-code and be able to edit them. (2) Add a tool so that you can resize a project or parts of a project.
    At the present time, I am using scrap wood to get familiar with the machine and its features. This is a hobby for me and I look forward to many hours of making sawdust and some nice projects.

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  12. Georges P. (verified owner)

    I have not use the CNC much yet since I’ve been working but the projects I have been able to run of it came out within specification of the CAD designs. It is very accurate and very powerful as well. For the price, it is a good machine. Assembly was straightforward. The only problem I have encounter is with the limit switches. I seems to get errors running codes when the switches are on. So far, I have turn them off. Hopefully the software gets better and the switches works without faults.

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  13. Cam L. (verified owner)

    Assembly was super easy. Definitely a little time consuming but the instructions were incredibly detailed and easy to follow.

    Once it was together and set up it took some time to get the hang of the design program (I’m using Carbide Create Pro) but GSender was intuitive.

    I’ve made crib boards, cutting boards, trays and a few signs.

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  14. Steven (verified owner)

    Very easy to put together. One thing that would be good to include is a long allen key to adjust the antibacklash nuts after it is all put together.

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  15. Jeffrey Monroe (verified owner)

    I have been looking at CNC routers off and on for about 10 years. I could never find anything that fit my budget and situation. I stumbled on Sienci Labs and the Longmill through You Tube about a year ago. It was a perfect fit. I finally pulled the trigger last month. The assembly instructions were spot on and it has performed beautifully. I want to make a small business from it. I have completed my first project and it is a wall clock. I will upload pictures of it and my setup to the Sienci forum.
    The biggest learning curve is the V-Carve software. I am an engineer that uses Solidworks and AutoCad, so the curve isn’t too steep. The resources on your website are pretty extensive and thorough. The one thing I would like to see is a more comprehensive feeds and speeds chart. The G-sender control is good but has some quirks. Like not remembering the origin point and defaulting back to G54 at the end of every program. This has burned me a couple of times. The Longmill is an awesome product and valve. The biggest problem I have is trying to decide which project to do next. The possibilities are endless.

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  16. Joseph Alvord (verified owner)

    I love the CNC. I just finished my first inlay project and it came out amazing.

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  17. Douglas E. (verified owner)

    The order was filled and arrived before estimated delivery date. Assembly of the LongMill was easy and completed with the tools provided. Using the free g-sender software makes the process easy to get started making projects. I’m making serving trays, cutting boards, beer flights and much more with ease. Thanks for a great product that instills confidence and reliability.

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  18. John Adams (verified owner)

    Everything was as good as it should be

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  19. Louis LaRock (verified owner)

    Love the Longmill cnc , but the help you get when you run into a problem is about 0 , i emailed 2 weeks ago with a problem i was having still no response. as far as tech help they get a 0rating,

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  20. Jean Pascal Bellance (verified owner)

    Very good machine easy to setup and to use, still some issue to be fixed like some training issues, but overall it is a very good and robust machine. It’s my second CNC without too much experience, however the LongMill MK2 is much more easy to setup than my previous machine and also much more rigid and as a consequence much more precise

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  21. Matthew E. (verified owner)

    Being new to the cnc world I found the longmill very user friendly. The set up took some time but went together very well. I’m still playing with different software trying to decide which one I want but so far I’m having a lot of fun learning and look forward to making many projects!

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  22. Anonymous (verified owner)

    I am am 83 year old male with absolutely no CNC experience. I wanted a new hobby, so I investigated several areas and decides to try CNC, although with great apprehension. The Longmill MK2 seemed like a good machine at a reasonable price. I ordered the mK2 and it arrived in complete and good shape in about a week. Now, I had a great concern about my small amount of gray matter being able to handle the assembly. But, thanks to the videos that Chris made for assembly, I felt like an expert while putting it to gather. I was ready to attact the design software. I have tried a couple of different CAD programs and will try some more as I haven’t found one with the features I would like. ( You have to remember I have not had any experience in this area, so, there may not be such a CAD.) I have created several simple designs for practice. ( Halloween Lanterns, Boxes, Holiday and Cartoon plaques for grandkids and other items for friends and family. – remember this is a hobby for me.) The G-sender works great . There were a few mistakes in my projects, but they were my fault not the machines. I am very happy with the Longmill.
    I am very anxious for Chris to make a video for installing the Lasar on the Longmill as I am excited to purchase one.
    Thanks for this affordable machine
    “This old man”

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  23. Andy B. (verified owner)

    have had no issues with my longmill mk2 works great.

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  24. mark L. (verified owner)

    The set was very easy when follow the instructions and I reference the U Tube video just verify a couple sections.

    Operations on Cnc is very good.
    It easy to operate. I am using
    V CARVE Pro.and G sender for my Operations of the CNC

    when I ordered the cnc I forgot to mention my influence was from Garrett from Idc woodcraft

    I’ve made a few signs . ABC block of family members names,and placement
    cut outs on plac, memories plac. Cutt out circle for cornhole borads
    [Rotating] Sploil board. Wood clamps, wood surfaces

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  25. Garry Strout (verified owner)

    Good so far. No prior experience.

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