The LongMill MK2.5 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.
Turn your ideas into a reality with the LongMill Benchtop CNC MK2.5
The LongMill MK2.5 is an improved version of the LongMill MK2, with changes including:
The new SuperLongBoard
Spring Loaded Anti-Backlash Nuts
…and other minor changes.
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 plastics, soft 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. PleaseNote*Power supplies are 110V only, (North America). If you live in a country with 220V/240V power, our standard LongMill MK2 power adapter must use a transformer with a rating above 300 watts to convert their power to 110V/120V
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
Size
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.
Add-ons
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.
We recommend using the RT0700/RT0701Makita trim router with your LongMill (we only sell the 110V version). 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.
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.
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.
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 allow users to add homing and limit switch functionality to their machines. We only recommend this kit to advanced users
FAQ
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!
Warranty
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.
439 reviews for LongMill Benchtop CNC MK2.5
4.8
Based on 439 reviews
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Rated 5 out of 5
David Wang –
I haven’t had a mechanical issue with it so far. I upgraded to the newer springloaded antibacklash nuts a while ago just so that I didn’t have to manually adjust using the old delrin antibacklash nuts. Community has been helpful and I look forward to doing more with my Sienci Longmill!
(0)(0)
Rated 5 out of 5
Walter Hoggan –
Absolutely amazed at quality of product. Built very easily and up and running making some carvings.
(0)(0)
Rated 5 out of 5
Sébastien C. –
Parfait
(0)(0)
Rated 5 out of 5
Doug Davidson (verified owner)–
Fun to build and use. Will be getting upgrades soon
(0)(0)
Rated 1 out of 5
JOHN HORTON (verified owner)–
THE MACHINE HAS BEEN SET UP FOR A YEAR BUT IM OLD AND NOT VERY SMART. CONSEQUENTLY IT HAS BEEN SITTING UNUSED I DESPERATELY NEED TO LOCATE A PERSON WITHIN A 100 MILES OF LINDEN TEXAS THAT I CAN CONTACT A BEG FOR HELP TRAINING ME AND SOME OF MY STUDENTS DO YOU HAVE A NAME OF SOMEONE I CAN CONTACT?
(0)(0)
Rated 5 out of 5
Troy Powell (verified owner)–
really like
(0)(0)
Rated 5 out of 5
Kevin Hobbs (verified owner)–
This machine is wonderful!!!
(0)(0)
Rated 5 out of 5
Dale Shoemaker (verified owner)–
Works great for my projects
(0)(0)
Rated 5 out of 5
David C. (verified owner)–
This CNC machine has preformed very well. I had no CNC experience going in to this. Assembly was straight forward. So far I have printed several reliefs and a bunch of wavy flags. Detail is excellent. I had some trouble with the Z axis sticking. It would stick going up and then plunge too deep having lost track of where it was. Grease fixed that. One should definitely be present while this is running. This CNC was at a good price point and I like how they don’t gouge a person on the Makita router or bits. I would consider their closed loop system in the future which also looks reasonably priced. Well done Chris and team.
(0)(0)
Rated 5 out of 5
Guy R. (verified owner)–
I have using the LongMill machine for a year and a half and with any new technology there is always a bit of a learning curve,that said, the LongMill is very easy to learn, very predictable in its behaviours, powerful and fast enough for a hobby machine. I have built about 50 different projects and over a 150 items from beautiful boxes with airtight lids, to topographical models of Barbados and Newfoundland. The support from Sienci Labs has been excellent, for example, when I ordered the new super long board, I ran into a small problem with the emergency stop and a new one was on its way within a day. Best machine out there for the twice the price.
(0)(0)
Rated 5 out of 5
Courtney Logue (verified owner)–
Great Value. Easier more accurate Tram method would be good.
(0)(0)
Rated 5 out of 5
Rene Poel (verified owner)–
Wat een prachtige machine!
Snelle levering, makkelijk in elkaar te zetten en mijn eerste werkstukken zijn werkelijk geweldig geworden.
Kortom, ik ben superblij en verwacht er nog heel lang plezier van te hebben.
(0)(0)
Rated 5 out of 5
DAVID (verified owner)–
I have enjoyed the using the machine with >50 projects made I continue to teach and improve my techniques.
(0)(0)
Rated 5 out of 5
Don Rutan (verified owner)–
Machine works great though have alarm issues with auto stops some times and have to reset
(0)(0)
Only logged in customers who have purchased this product may leave a review.
David Wang –
I haven’t had a mechanical issue with it so far. I upgraded to the newer springloaded antibacklash nuts a while ago just so that I didn’t have to manually adjust using the old delrin antibacklash nuts. Community has been helpful and I look forward to doing more with my Sienci Longmill!
Walter Hoggan –
Absolutely amazed at quality of product. Built very easily and up and running making some carvings.
Sébastien C. –
Parfait
Doug Davidson (verified owner) –
Fun to build and use. Will be getting upgrades soon
JOHN HORTON (verified owner) –
THE MACHINE HAS BEEN SET UP FOR A YEAR BUT IM OLD AND NOT VERY SMART. CONSEQUENTLY IT HAS BEEN SITTING UNUSED I DESPERATELY NEED TO LOCATE A PERSON WITHIN A 100 MILES OF LINDEN TEXAS THAT I CAN CONTACT A BEG FOR HELP TRAINING ME AND SOME OF MY STUDENTS DO YOU HAVE A NAME OF SOMEONE I CAN CONTACT?
Troy Powell (verified owner) –
really like
Kevin Hobbs (verified owner) –
This machine is wonderful!!!
Dale Shoemaker (verified owner) –
Works great for my projects
David C. (verified owner) –
This CNC machine has preformed very well. I had no CNC experience going in to this. Assembly was straight forward. So far I have printed several reliefs and a bunch of wavy flags. Detail is excellent. I had some trouble with the Z axis sticking. It would stick going up and then plunge too deep having lost track of where it was. Grease fixed that. One should definitely be present while this is running. This CNC was at a good price point and I like how they don’t gouge a person on the Makita router or bits. I would consider their closed loop system in the future which also looks reasonably priced. Well done Chris and team.
Guy R. (verified owner) –
I have using the LongMill machine for a year and a half and with any new technology there is always a bit of a learning curve,that said, the LongMill is very easy to learn, very predictable in its behaviours, powerful and fast enough for a hobby machine. I have built about 50 different projects and over a 150 items from beautiful boxes with airtight lids, to topographical models of Barbados and Newfoundland. The support from Sienci Labs has been excellent, for example, when I ordered the new super long board, I ran into a small problem with the emergency stop and a new one was on its way within a day. Best machine out there for the twice the price.
Courtney Logue (verified owner) –
Great Value. Easier more accurate Tram method would be good.
Rene Poel (verified owner) –
Wat een prachtige machine!
Snelle levering, makkelijk in elkaar te zetten en mijn eerste werkstukken zijn werkelijk geweldig geworden.
Kortom, ik ben superblij en verwacht er nog heel lang plezier van te hebben.
DAVID (verified owner) –
I have enjoyed the using the machine with >50 projects made I continue to teach and improve my techniques.
Don Rutan (verified owner) –
Machine works great though have alarm issues with auto stops some times and have to reset