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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

(224 customer reviews)




Due to high demand, LongMills are expected to ship within 5-6 weeks from the time of order. Each machine is made to order, stock levels are not an indication of shipping times.

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:

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.

224 reviews for LongMill Benchtop CNC MK2

  1. Cory LaNou (verified owner)

    I’ve always loved woodworking. I’m also a software engineer. This CNC machine has married my two passions together. It is amazingly easy to use, very robust, and does more than I would have imagined. One of the top 5 purchases of my lifetime.

    Also, I would be remiss if I didn’t mention the support and community around this machine. It had great video instructions on step by step assembly. It went flawless. And knowing how the machine is put together has allowed me to continue to calibrate as necessary as I’ve used the machine.

    All in all, 10 out of 10. Great job!

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  2. Jerry Lancelle (verified owner)

    Easy to assemble and very rigid when setup properly. So far I have no complaints and have completed several projects.

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  3. Donald Dale (verified owner)

    Great CNC, easy to assemble and use

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  4. Ray Schaeffer (verified owner)

    This machine was a joy to put together, the videos that Chris made plus the written instructions were so very easy to follow. I really appreciated the extra parts and though I never needed to call for help it was a comfort to know it was there if needed. Most of the time I was wondering why this is all going together so well, like when will the other shoe drop! I am just now cutting some MDF to get started on a spoilboard. I ran the machine through some dry runs from Garret Fromme and the machine is working very well. Thankyou so much, I could go on and on with my experience so far but I just wanted to say thanks for now.

    Ray Schaeffer

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  5. Gilbert Chabot (verified owner)

    What a beautiful machine, it is fully assembled now. I’m 78, having fun like crazy. My first project was my pain plate. I put inserts at 2 inches. And my 90 degree point 0. I got a fair amount of eccentricity and quantit. of fixing blocks. I love GSender and its surfacing. I had a little experience with my little 3018, which I will never part with. My first real project is the 3D engraving of a 24″ high cross. The scale of this project proposed a thickness of 46 mm. I therefore learned to make a lowering of the engraving plane. Only one small problem, GSender which stops working in the middle of a project. By account, a quality USB connection cable solved all that. I also have the community on Facebook.
    Thank you for everything.

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  6. David Sander (verified owner)

    Hi, Longmill is great now had to work out a few little bugs. The only problem I have is getting my limit switches to work right there is no videos or instructions how to set them up. Jason did give me a few notes in an email but I haven’t got them to work right yet And the backlash of X I’ve had to file it down because they made it too thick still don’t think I have it right yet

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  7. Steven P. (verified owner)

    Fairly easy setup. Took some time but overall the steps were very easy to follow. Have done a few projects now. The learning curve wasn’t that bad for me, having working in the CADD world for most of my adult life. You tube is also has been very useful learning the tricks and trades of using a CNC machine. Having a bit of an issue with the tracking wheels, trying to find a happy medium. Even when fully open, their still hard to turn by hand. So not sure what’s happening there. Overall, great machine!!

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  8. Ryan H. (verified owner)

    Thanks guys. I’m trudging along, learning at a frustrating but progressive rate and elated when I turn something out!

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  9. Anonymous (verified owner)

    For an individual with no background in CNC, setup was overall smooth. Customer Service was great when I had questions about packaging. At this time, I’ve been working with programming but have only made one sign so far, but it’s turned out great!!

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  10. Ronald Carpenter (verified owner)

    The machine is fine. I need some technical support for calibration and getting getter to work in inches, and setting up probe.

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  11. Geoffery Prouse (verified owner)

    Newbie…. So still very excited about it. Created my first project last week. Gonna work on a new project tonight. Lots to learn but very easy so far to learn.

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  12. Jerry Johnson (verified owner)

    Sorry it took so long to reply Chris, I purchased the LongMill 48 x 30 for a Christmas gift. I started assembling it the next day and with the help of your videos was able to complete the assembly quickly. I was having trouble with the x axis lead screw jamming. I kept trying to tune it to no avail. I must say I was getting frustrated, but I kept at it. When I adjusted it to be more square I finally was able to get it to work properly. Your resources area was a great help. I also purchased the Auto zero touch plate. It worked great the first time but then stopped working. Again the resources area on your website helped me again. I tested the continuity of the wiring and was able to find the problem. The ground wire at the magnet was not making contact. I removed the screw and slightly bent the connection ring, reassembled it and I was in business. I made a spoilboard today and the LongMill preformed wonderfully. Thank you so much l’m loving it. Jerry

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  13. Neil Hollywood (verified owner)

    The cost of this machine is money well spent compared to other machines. It’s very sturdy and the instructions for assembly were outstanding. The sender works very well and I bought vcarve pro and am thrilled with how user friendly it is. However, I didn’t mind paying the $80 for shipping as it would have cost me that to go pick it up but when I went to buy a 1/4 in compression bit for $29 and the shipping was $15 , I was slightly annoyed and will buy elsewhere. I think Sienci labs has made a great and very user friendly machine. Thanks guys

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  14. Myerin (verified owner)

    I’ve had my Longmill 30×48 set-up for a month now and getting good results with it. I make custom signs, plaques, home decor, and other items. The team at Sienci has been awesome with the couple of technical questions I have had. All in all, I would make the purchase again. Keep up the good work!

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  15. Michael Gerrior (verified owner)

    Great machine user friendly, super support staff and network.

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  16. stephen Buck (verified owner)

    really impressed with the longmill, the machine went together easily by following all the videos on there site. the wealth of info on there website is also great, it lets you really learn about the cnc and software. Best part is they are made in Canada

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  17. Bob Eggleston (verified owner)

    Love love love the LM2. You’ve no doubt heard of “football widows” and such the like, but there needs to be a new term for us robot loving weirdos and our poor wives, the “LM2 widows.”

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  18. otis gideon (verified owner)

    I love the Lazer fixing to start using CNC part couldn’t stop playing with Lazer lol

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  19. Anonymous (verified owner)

    Great to deal with. Machine works great!

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  20. Dave (verified owner)

    Longmill still in boxes, Hope to be up and running mid January!

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  21. Anonymous (verified owner)

    Love this machine so far. Once i got over a few hiccups everything is great. Only thing I dont like is the amount of wobble in lead screws. I suggest that for the bigger 48×30 the x axis should be a linear rail.

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  22. Lawrence Bollig (verified owner)

    Assembly went smoothly,had a little binding when run to back on y axis,went through all adjustments and now works great.made a few signs ,mainly in learning stage and getting garage/ shop set up,also joining users group at local rockler store

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  23. Michael Major (verified owner)

    Actually, I’m still arranging my shop. At this moment my LongMill is still in the box. However, as soon as I can I will be very happy to complete this. Thanks!!!!

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  24. Jay Nielson (verified owner)

    I had problems with the dust boot nut fitting in the slot.
    I had/have problems with the wire coming out of the magnet connector of the probe.
    I am still making a spoilboard and as soon I started a X-axis grinding noise started happening and gets worse every time I proceed so far.

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  25. Mark (verified owner)

    Could not be happier with the Longmill. The assembly process was very straightforward with excellent manuals and videos for each stage in the process. The quality and fit of all the parts made it very easy to get the frame assembled very square before refining with the built it calibration routine in gSender. It took a day to go from nothing to a flat spoil board. The electronics came together well and hook up to the PC and software went without a hitch. I downloaded Vectric 2D the next day and was cutting a simple bowl by the end of the day. What really helps is the community pages with lots of great information and continuous help from Sienci like the speeds and feeds doc which is really helping me achieve great results so quickly.

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