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LongMill Benchtop CNC MK2

(357 customer reviews)




LongMills are expected to ship within 1-5 days from the time of order. Each machine is made to 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? Check out the Beginners Kit.

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

Weight60 lbs
Dimensions8 × 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.

357 reviews for LongMill Benchtop CNC MK2

Based on 357 reviews
Showing 39 of 357 reviews (4 star). See all 357 reviews
  1. Jack D. (verified owner)

    Machine is great. Still learning, but made 2 simple projects and one more complex and happy with the performance. Some pre-assembly ( putting small parts together so they could still ship in one box) would be even better. Putting it together was a bear with too many steps.

    (1) (0)
  2. LARRY ROBINSON (verified owner)

    I have enjoyed playing with the Longmill, I am a CNC machinist on large Mills and Lathes and really just wanted something at home to display some methods to teach others some Gcode related things plus have another tool in the shop for useful things. I have been happy with it so far, I honestly can say I absolutely hate the fact that G Sender doesn’t have Gcode on the screen like UGS does so I think it’s dangerous not to be able to look at and edit as needed. But I am using the latest version of Gsender Edge trying to force myself to like it. The rigidity of this machine is pretty good, Maybe the Z lifter could use some beefing up but in this price market it’s everything and more that I would expect honestly. Happy with it.

    (0) (0)
  3. Louis Carusone (verified owner)

    Being a new with CNC, CAD/CAM, Routers, Youtubing and such I have had a lot of things to learn. It is like the chicken and egg question as where to go first. As far as assembly I believe with the viewing the assembly videos and the instruction manual this was a very good experience. I have had a couple of reasons to interface with customer service and it was a very good experience. I have had the machine for only a little over a month but have been able to do a tuning project, surface the spoil board, create to signs, and put T Slots in the spoil board for holding. I think more priority should be put on tuning as this is where I have had most of my problems so far.

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

    Alot of issues with USB, once I switched to a heralded USB problems went away and works beautifully

    (0) (0)
  5. Randall C. (verified owner)

    I’m currently still assembling it. It should have come with an inventory sheet in the box so we can verify that we have everything. I downloaded the assembly pdf because it was easier to follow. It was well done but unfortunately some items were different with more holes to choose from. I always chose the wrong holes and had to disassemble and reassemble. I was missing nylon washers. It was only after watching the video that I learned they were optional. I was missing the 10mm screws, not optional. I ordered some more just to expedite the process. I should have it done by the weekend. I will give another update at that time.

    (2) (0)
  6. Jeff (verified owner)

    Some parts broke setting up the cnc. Replacement parts were sent at no charge. Its been over a month now and I still haven’t used it besides the surfacing. Difficult to get some guidance. Frustrating..

    (2) (0)
  7. David Jordan (verified owner)

    Great machine but there seems to be alot of issues around EMI. Maybe add some ground options? Great team

    (2) (0)
  8. Kevin Turner (verified owner)

    4.9 cause everyone needs to improve but service, parts, phone calls have been professional and curtious.
    A set up jig for frame rails etc would be a nice touch.
    Vectric could send a laminated icon/ user manual for off screen visual reference. All in all, I’m glad I purchased my longmill MK 2

    (1) (1)
  9. Tom Pulles (verified owner)

    Base price is good ….. seems to add up as you go throught the entire ordering process though, but definitely one of the best values in the hobbyist CNC marketplace

    (2) (0)
  10. Harold Kemp (verified owner)

    Once I got it all set waste the fort I was doing my waste bored my router burnt up, but so far everything else is going good

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

    Very good quality machine with multiple applications great for the cost!

    (1) (0)
  12. Dale Manley (verified owner)

    Other than Z Axis lead screw coming loose and falling through twice and ruining 2 projects everything has been working fine . I keep that lead screw fitting tight to the point of stripping it out and it still fell off twice. Not from motor side but lead screw side

    (1) (0)
  13. Lynette Hoaglund (verified owner)

    Overall I love this machine. I don’t believe you can find a machine that is comparable at this price point. It done some unexplainable things when I first started running it but now seems to be operating as it should. However, I am still having trouble with getting the Vwheels adjusted and keeping them adjusted? I get them adjusted to where I believe they should be so that I can turn them by hand with a little effort but, after a short run they tighten up to where turning them by hand is impossible and they begin to make a squeaking noise while in operation or they loosen up and you can free wheel them? I’m sure it is something I am doing wrong but I can’t seem to find that sweet spot to where they stay in adjustment. Any advice on resolving this issue would be greatly appreciated.

    (1) (0)
  14. Wayne Zint (verified owner)

    My experience with my Longmillmk2 has been challenging. As a 70 yr old person taking on this machine is quite rewarding. Although I’m not the smartest cracker in the package, I’m learning something every day. I’ve had my longmill set up for several weeks but haven’t put to operation yet. I’ve been doing lots of youtube tutorials and trying to soak up the basics so I can get started. Learning to use the software is quite a challenge. I use Garrett Fromme tutorials alot which he goes into extensive details. You guys along with vetric tutorials are great too. The challenges are out there, and if I can do it, so can anyone else. Chris i appreciate your extensive help in showing us all how to assemble the machine. To all of you at Sienci Labs, Thanks again!! , Wayne (Amarillo Texas)

    (1) (0)

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