$1,615.00–$2,015.00Price range: $1,615.00 through $2,015.00
The LongMill MK3 Beginner’s Kit is your all-in-one, plug and play, desktop CNC. Designed with newcomers in mind, this starter kit gives you the rigidity and reliability you need at a price point you can work with.
The MK3 has a 4.6″ z-axis cutting clearance, 49″ x-axis (48×30) or 32″ x-axis(30×30) cutting width, and 32″ y-axis carving length. It can handle materials ranging from softwoods to hardwoods, and plastics and foams to acrylics and even aluminum. It runs on a closed-loop stepper motor system, and comes equipped with a grblHAL-based CNC controller. Its linear rail system allows for production-level performance not found in similar hobby-level machines. It comes equipped with everything you need to start carving on day one. It’s easy to set up too. Purchasing this kit also saves you roughly $100 CAD/$100 USD vs buying the accessories individually.
Each Beginner’s Kit includes:
A 30×30 OR 48×30 LongMill MK3 CNC Machine
An SLB-LITE 32-bit grblHAL Controller with E-stop
An AutoZero Touch Plate
A LongMill MK3 Dust Shoe
An AutoSpin T1 Router
A Starter End Mill Set
The LongMill MK3 represents the best entry-level, hobby CNC in terms of performance, design and customer support. It’s the fastest, most rigid CNC machine in its size and price category, and comes pre-assembled so you can be up and running within an hour, right out of the box.*
Machine is pre-assembled for a quick, plug and play set up in just under 60 minutes*
Accessible, capable and affordable
Ideal for hobbyists and entry level consumers
Cuts materials ranging from softwoods to hardwoods, and plastics to foams, and acrylics to even aluminum
Closed-loop stepper motor system (detects when it loses steps)
Advanced, production-style features including y-axis auto-squaring and limit switches by default
Lead-screw and linear guide rail motion system with anti-backlash nuts for precision
Table mounted, flexible for any setup
Industry leading hobby-level cutting speeds of 275 inches per minute
Z-axis maximum travel: 5.1”
Z-axis clearance: 4.6″
30×30: 32″ cutting width on the x-axis / 32″ cutting length on the y-axis
48×30: 49″ cutting width on the x-axis / 32″ cutting length on the y-axis
*A 60 minute set up is an estimate only, based on internal testing and expected assembly of pre-assembled parts.
Images may contain items for illustrative purposes, including but not limited to: caster wheels, t-tracks or additional shelving. There may also be cosmetic differences between the machine in the photos and the production version of the LongMill. Some photos may also be 3D renders of the machine.
Additional information
Weight
32 lbs
Dimensions
8 × 50 × 10.5 in
Machine Size
30×30, 48×30
What's Included
***Included with your LongMill MK3 Beginner’s Kit***
One (1) LongMill MK3 Benchtop CNC (either 30″ x 30″ or 48″ x 30″, as per your selection)
One (1) AutoSpin T1 Router*
One (1) SLB-LITE, 32-bit CNC Controller
One (1) AutoZero Touch Plate
One (1) LongMill MK3 Dust Shoe
One (1) Starter End Mill Set
Pre-assembled rails, electronics, power supply*, drivers and motors to get you up and running quickly
***Not included with your LongMill MK3 Beginner’s Kit***
Computer or laptop
Work surface (e.g. MDF sheet)
Screw drivers, standard bits or drill for assembly
PleaseNote:
*Power supplies are dual voltage to accommodate 110V (North America) and 220V (International). If you’re using the LongMill MK3 in another country, you may need a plug adapter to accommodate a NEMA 5-15P plug. Routers we supply will be 110V (North America). If you live in a country that uses a different voltage, please purchase a router in your region. See FAQs for more details.
Specifications
Specifications
30×30
Footprint: Approx. 40’ x 45’ x 20’ including motor space / 1016mm x 1143mm x 508mm
X- & Y-Axis Working Area: 32” x 32″
48×30
Footprint: Approx. 60’ x 45’ x 20’ including motor space / 1524mm x 1143mm x 508mm
X- & Y-Axis Working Area: 49″ x 32″
Z-Axis Maximum Travel: 5.1”
Z-Axis Clearance: 4.6″
Motion System: T12 Lead screws on all X, Y, Z axes
Linear Motion: 15mm profiled linear guide rails and bearing blocks on all axes
Drive Motors: High-torque NEMA 23 closed-Loop stepper motors; 1.2 Nm on all axes
Control System: SLB-LITE controller with grblHAL firmware
Power Supply: 24V DC, Class 2 Certified
Weight: 30×30 approx. 72lbs when assembled / 48×30 approx. 80lbs when assembled
Spindle Mount: Supports both 65mm routers and 80mm spindles*
*When using an 80mm spindle and a dust shoe, cutting area will be reduced.
I’m unsure what to buy, so what’s the difference between the LongMill MK3 and the AltMill? We built the LongMill MK3 with entry level/beginners on a budget in mind. The AltMill is aimed more towards prosumers and semi-industrial use. For a full comparison, check out our video:
What spindles or routers can I use? While we recommend our AutoSpin T1, you can also use other 65mm trim/palm style routers. Your LongMill MK3 comes with a standard 65mm mount. You can also use our 1.5KW spindle but its current dust shoe is large and will reduce the cutting area.
Is the LongMill MK3 compatible with the Makita RT0701? Yes it is, and all LongMill MK3s will come with a 65mm mount. Please note that you may need to use an extension cable for the Makita RT0701 to pass through the drag chains.
What are the power requirements? We recommend allocating two 15A 110V/120V circuits — one for the router/spindle and dust collection system, and the other for the machine and a computer.
The LongMill MK3 consumes 96W and runs off 110/220V, 24VDC 4A, Class 2 Certified power supply
The AutoSpin T1 Router consumes 800W at max load and runs off 110V (not compatible with 220V)
The 1.5KW LongMill Spindle Kit consumes 1500W at max load and runs off 110V
What are international power requirements? Power supplies are dual voltage to accommodate 110V (North America) and 220V (International). If you’re using the LongMill MK3 in another country, you may need a plug adapter to accommodate a NEMA 5-15P plug. Routers we supply will be 110V (North America). If you live in a country that uses a different voltage, please purchase a router in your region.
What are the motor specifications? The LongMill MK3 uses 1.2NM NEMA 23 closed-loop motors. See details and drawing below.
Motor frame size: NEMA 23
Motor torque: 1.2NM
Voltage: 24-48VDC
What controller does the MK3 come with? The LongMill MK3 comes with the SLB-LITE, a newly redesigned version of our original SLB. It uses a 24V power supply, and can support motors (open and closed-loop) with external drivers.
What materials can the LongMill MK3 cut? The LongMill MK3 can cut these materials reliably, with the proper cutting tools, feeds and speeds, lubrication/misting and/or cutting strategies:
Woods: Softwoods, hardwoods, plywood and MDF
Plastics: Acrylic, PVC, HDPE, Polycarbonate and ABS
Composites: Carbon Fiber, Dibond and ACM
Non-Ferrous Metals: Aluminum, brass and copper
Foams: High-density sign foam and insulation foam
What else will I need to get started to use the machine?
Computer or laptop
Work surface (e.g. MDF sheets)
Screw drivers, standard bits or drill for assembly
Dust collection system
Will the LongMill Mk3 work with an ATC? No. Our ATC system is only compatible with AltMill branded machines.
Do you have payment plans for the LongMill? At this time, no. Full payment is required at time of purchase to get your order into the queue. We ship on a first-come, first-served basis. If you choose local pick-up, you are subjected to the queue order and cannot get your machine quicker.
Do you ship internationally? We do not have distribution centres but we ship internationally from our office via UPS. Shipping costs vary in Canada and the US, typically in the range of $100 USD per machine, and European shipping in the range of $200-$300 USD. Far reaching international locations may cost over $1,000 USD. You are responsible for any taxes, duties and brokerage fees. Shipping estimates are provided at check out.
Will I be able to upgrade my LongMill MK1, MK2 or MK2.5 to the MK3? Practically speaking, no. The LongMill MK3 is a complete rework of the design, so the cost difference between buying a new, full machine and doing an upgrade would be negligible.
If I buy a 30×30, can I upgrade to a 48×30 later? Yes! We will eventually make the parts required to increase the size of the X-axis to convert a LongMill MK3 30×30 to a 48×30 available. However, we do not currently have specific plans to have them available at the time of launch.
Does the LongMill MK3 support Sienci Labs’ accessories? Yes, any accessories from the LongMill MK2.5 and prior will work with the LongMill MK3, with the exception of dust shoes, which have been designed specifically for each version of the machine.
Can you tile/pass sheets through the back of the machine? Definitely. Just like all our machines, the rear of the LongMillMK3 is open and you can pass larger sheets through the machine. It should be noted that you may need to position or route the Y motor cable in a way to prevent interference with material if you do choose to do tiling.
Can you mount the LongMill MK3 vertically? Yes! With the substantially stronger motors and larger lead screws, we expect essentially no performance drawbacks in mounting your machine vertically.
What will support look like for owners of LongMill MK1, MK2, and MK2.5 machines? Support will continue to be largely the same: we have stockpiled between 3-5 years of spare components to support our users of older machines. Open source design files and specifications are available through the respective resource pages of each machine to allow users to source alternative components if necessary. Otherwise, technical support will remain the same for all versions of the machine.
Is the SLB-LITE controller available for purchase as a solo item?
As of May 2026, it is not available as a solo item for purchase. It is expected to be available as a solo item once we begin shipping machines in the fall of 2026.
Warranty
The AutoSpin T1 Router comes with a 1-year warranty starting at the time of arrival to the customer against manufacturing defects.
Items such as our AutoZero TouchPlate and LongMill MK3 Dust Shoe are covered under our 60-day warranty. Learn more.
Consumables such as End Mills that have been opened or used are not covered under our 60-day warranty. Learn more.
The LongMill has a 120 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 May 26, 2026 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’ LongMill MK3 30×30 and LongMill MK3 48×30. 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 one hundred and twenty (120) 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.
We will be shipping to US customers with UPS option only.
All customers can purchase a LongMill MK3 (it’s not impacted by Ontario ESA Compliance in Canada).
Status as of May 26, 2026: The LongMill MK3 will start shipping in waves. The first 300 machines are expected to start shipping mid-September 2026, in the sequence in which they are ordered. This first wave of shipments is expected to take a minimum of 4-6 weeks to clear out the queue. The next round of machines will be on back order, and most likely start shipping mid-to-late-October 2026, based on the order in which they are received. Check your Order Status to see when your MK3 is expected to ship. We will provide general updates as needed via our socials and emails as we approach our expected ship date of mid-September.
Updated May 2026.
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