We’re constantly trying to keep this list updated so that everyone can have easy access to the answers to the common questions that many people have.

If you can’t find the answer that you’re looking for here, then try to reference our LongMill Info Page, existing Mill One FAQ Page, or take another look through this forum or our Facebook User Group.

General Info

What's a CNC router?

CNC stands for ‘Computer Numerical Control’, meaning that a CNC router is basically a computer-controlled, robotic carving tool that’s driven by precision motors.

This means that you can put any piece of material you’d like into a CNC router and end up with a cut-down object made of that material; whether it’s a sign, a gear, a circuit board, or a 3D scan of your face.

Are they noisy/ dusty?

Operating any CNC router comes along with some noise. This noise mainly comes from the router when it’s turned on, as well as the noise made when cutting different materials. When cutting through softer materials the router can run slower, making it quiet enough to have a conversation next to it.

You might also think that dust and material debris would be a large issue, however the Mill One’s partial enclosure is surprisingly effective at capturing more than 90% of particles that come off the material when cutting. The LongMill is harder to enclose so we’ve designed a dust shoe for it so that you can attach a vacuum to collect the dust as it cuts. If you want to keep dust and noise to a minimum, placing you CNC router in another room or in a garage will suffice.

What's so different about our machines?

Our CNC routers are open-source projects, made FOR makers BY makers. Many people have never had access to CNC routers before because of all the barriers to entry that currently exist with the technology. They’re usually expensive, difficult to build, and complicated to use. We aim to eliminate these barriers.

By prioritizing simple design and the use of standardized materials and parts, we can create high caliber machines at lower price-points. Less parts also means less assembly time, minimized points of failure, and easier maintenance.

Open sourcing also means that we’ve released our machines to the world to put the power back into the hands of the CNC community. We hope that having the choice to either access our plans and make your own machine, or purchase one from us, will bring more accessible machines to the market for everyone to enjoy!

What do I need to run one?

Our machines are made to be very easy to set up and use. Other than buying the kit, you will need to purchase a router (unless you purchase a kit with a router) and that’s it! Any computer can be used to control the CNC during its operation, and the software required to run them is free and easy to download. As long as you have the few simple tools required to assemble the kits, then you can get cutting in no time!

What software can I use on my machine?

The LongMill and Mill One are compatible with dozens of free and paid CAM software; they use standard G-code. See a list of tested CAM software here (https://sienci.com/longmill/software/). We’ll be hosting webinars and creating additional resource videos to help you learn to design and program your CNC machine.

Are there any minimum system requirements for the computer that controls the CNC?

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.

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 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 12x12: 23.8"(l) x 23.9"(w) x 13.6" (h)
LongMill 12x30: 23.8" (l) x 43.3" (w) x 13.6" (h)
LongMill 30x30: 43.5" x 43.3" (w) x 13.6" (h)

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.

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 will create an kit that will allow you to add end stops in the future.

Mill One

What are the dimensions of the machine?

Once assembled, the Mill One is approximately 17” x 17” x 11 ⅞” (430mm x 430mm x 300mm).

What's the largest thing I can cut on the Mill One?

The maximum travel dimensions of the Mill One are approximately 10.15″ x 7.25″ x 3″ (258mm x 185mm x 76mm). The thickness of the materials you can cut is determined by the length of your cutting bits and the material type. The Mill One’s cutting volume rivals that of many other desktop CNC routers at a fraction of the cost!

How long does it take to assemble the Mill One kit?

It takes most users around 3-4 hours to assemble a Mill One kit. Not only is it the easiest CNC router to assemble on the market but we’re continuing to iterate on the assembly process to ensure that it remains easy and enjoyable for both beginners and experienced makers alike.

Does the Mill One come with a warranty?

We want to do everything we can to ensure that your experience with the Mill One is exceptional. Our warranty on the machine will ensure that you end up receiving your Mill One kit in perfect working condition, even if something goes wrong the first time.

What is the weight and package size of the Mill One kit?

The Mill One kit comes in a box that’s approximately 20” x 14” x 10 ½” (510mm x 355mm x 265mm) and weighs about 33 lbs (15 kg) with the router included.