LongMill Benchtop CNC


The LongMill is a powerful and affordable hobby CNC router perfect for any workshop.

This machine comes in three different flavors, with a 12″x12″ work area, 12″x 30″ work area, and 30″x30″ work area. Each machine has approximately 4.5 inches of Z axis travel.

Get an instant price for shipping at the cart.

Due to the current shipping backlog, orders placed now expect to ship in 4-6 weeks. For further details about production, please read our latest update.



The LongMill has default router mount sizes of 52, 65, 71, and 80mm diameters. Please provide the model of the router you are planning on using with your LongMill (if you are using your own)

SKU: longmill Category:


Turn your ideas into a reality with the LongMill Benchtop CNC

We designed the LongMill to be rigid, reliable, and easy to put together. With larger extruded aluminum rails, fully supported Y-axis, 1/4″ steel gantries on all axes, and high precision MG-12 type linear guides on the Z-axis, the LongMill is the most powerful CNC router in its class and price point.

Photos shows the latest 30×30 version. 12×12 and 12×30 photos coming soon.

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

The LongMill and it’s software works on any computer and connects using standard USB. The total machine working area can be configured as 12″ x 12″, 12″ x 30″, 30″ x 30″.

Every kit comes with all…

  • Hardware, rails, lead screws, and gantries
  • Motors, drivers, and electronics
  • Software (downloadable from our website)
  • Instructions (downloadable from our website)

Assembly only takes a few hours, and can be done with a set of wrenches, allen keys, and a flat head screwdriver. There is absolutely no soldering. We’ve spent hundreds of hours designing and testing the LongMill to ensure that this machine is easy to put together. If you can put together IKEA furniture, then putting together the LongMill will be a breeze.

You will need to get…

  • Your own wasteboard/spoilboard (found at your local hardware store)
  • A router (purchase one from us, use one you already have, or find one at your local hardware store/online)*

*Routers that we supply will be 110V only (North America). If you live in a country which uses a different voltage, please purchase a router in your region. LongMills will come with a power supply that supports both 110V and 220V.

For routers, we recommend the Makita RT0700/RT0701. It’s a reliable and super powerful router that we’ve been using on our CNC machines for years.

Here are some other compatible routers we recommend

  • Bosch Colt
  • Dewalt 611

Don’t see your router listed? Let us know the diameter of your router so that we can make a router mount for you. If you do not send us a diameter we will ship you a mount for the Makita RT0700/RT0701 (65mm).

Please note that routers/spindles which are

  • Over 2.7kg/6lbs
  • Wider than 75mm/3″

May not be compatible (but we’ll try to make it work)


What makes this machine unique is that it is designed to be mounted directly to a wasteboard/spoilboard (we recommend using 3/4″ MDF) or other flat surface.

3/4″ MDF is readily available at virtually all hardware and lumber stores such as Home Depot and Lowes (you can even get them to cut it to size).

LongMill 12×12: Fits on a 2ftx2ft surface

LongMill 12×30: Fits on a 2ftx4ft surface

LongMill 30×30: Fits on a 4ftx4ft surface


Additional information

Weight 60 lbs
Dimensions 8 × 10 × 40 in

12×12, 12×30, 30×30


Standard Features:
– Laser cut, steel gantry plates for high rigidity
– Standard profile, extruded aluminum rails on the X and Y axis and MGN12 linear guides on Z axis
– Delrin V wheels with variable eccentric nuts
– 4-start, 2mm pitch, 8mm diameter ACME lead screw for high torque and fast movement
– NEMA 23 stepper motors on all axis
– 3D printed and aluminum parts
– Mount for Makita RT0701C routers, or request a custom mount size
– 24V power supply
– Arduino board loaded with GRBL firmware
– 4A TB6600 drivers

Add-on Features:
– Makita RT0701C router
– Independent Z axis dust shoe
– Z axis touch plate

Our machine uses open-source hardware and firmware, letting users build and modify their machines. Not only that, many of our components are standard and easy to source or 3D printable, making replacing parts easy.

The LongMill is proudly made in Canada in a way which supports local, growing businesses.

Machine size

These are the approximate dimensions of the machine (without the base). We recommend having a few inches around the feet of the machine to allow for space for wires, electronics, and other bits and bobs. Please note that dimensions can vary slightly.

LongMill 12×12: 23.8″(l) x 23.9″(w) x 13.6″ (h)
LongMill 12×30: 23.8″ (l) x 43.3″ (w) x 13.6″ (h)
LongMill 30×30: 43.5″ x 43.3″ (w) x 13.6″ (h)


You can include add-ons to improve the functionality of the LongMill. These are optional add-ons.

We recommend using the Makita RT0700/RT0701 router 110V ($150CAD) 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 up to 1/4″ shank tooling and can be used with a 1/4″ to 1/8″ collet adapter for use with 1/8″ tooling.

The Z-axis independent dust shoe ($45CAD) 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 keeps dust out of the air.

This dust shoe is adjustable in the Z direction, and the front bristles and vacuum hose can be easily unclipped to make it easy to change bits.

The Z-axis touch plate ($35CAD) allows you to “zero” the Z axis against flat surfaces. This makes it easy to very precisely find the distance between the tip of the tool and the surface of your material quickly.

The End Mill Starter Pack ($60) comes with a basic set of end mills to get your started. Each pack comes with:

  • 1/4″ Spiral Up Cut End Mill
  • 1/4″ Spiral Down Cut End Mill
  • 3x 1/8″ Flat End Mill
  • 3x 1/8″ Ballnose End Mill
  • 1/4″ to 1/8″ Collet Adapter


The LongMill has a 90 day warranty once it’s received.

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.

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, or intentionally causes damage to the Product.

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.


When will machines ship? 

The time your machine will ship can be found in the main description of the machine at the time of purchase.

What materials can it cut?

The LongMill can cut materials like wood, plastic, foam, and soft metals. We’ve also had customer cut tougher materials like thin stainless steel and copper sheet.

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.

Can I add end stops?

Although end stops are not needed on this machine, they can be added. Our electronics support end stops and is easy to integrate.

We’ll have more details on adding end stops soon.

What are the dimensions of the machine?

These are the approximate dimensions of the machine (without the base). We recommend having a few inches around the feet of the machine to allow for space for wires, electronics, and other bits and bobs. Please note that dimensions can vary slightly.

LongMill 12×12: 23.8″(l) x 23.9″(w) x 13.6″ (h)
LongMill 12×30: 23.8″ (l) x 43.3″ (w) x 13.6″ (h)
LongMill 30×30: 43.5″ x 43.3″ (w) x 13.6″ (h)

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!