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AltMill MK2 4×4

(169 customer reviews)

$4,290.00

The AltMill is the pinnacle of hobby CNCing, bringing industrial-level precision to a price point and ecosystem for both beginners and advanced users. The AltMill MK2 4×4 is your go-to CNC when time, performance and precision are crucial.

Included with your AltMill MK2 4×4

  • SLB-EXT controller and emergency stop
  • 48 Volt Power Supply
  • Partially pre-assembled rigid frame
  • Inductive sensors for homing
  • Sturdy metal legs with the ability to add 4ft wide shelving underneath
  • Welcome package

The AltMill MK2 4×4 comes with a standard 80mm spindle mount only. It does not come with a spindle, which must be purchased separately.

***New CNC users – Read these resources to ensure a successful start.***

This product has a lead time. Please click here to see our current lead times.

***Our products are subject to the USMCA and are not affected by the 35% tariff on Canadian goods at this time. Read how we are handling the situation. We will be shipping to US customers with UPS option only.***

    Description

    Highlights include:

    • Production level cutting speeds (approx. 600 inches/minute)
    • Closed loop motor system on all three axis to auto-correct positioning and auto-stop when necessary (reliable for production style work)
    • Requires little maintenance during project production
    • Advanced, production-style features including Y-axis auto-squaring; limit switches by default; and tram adjustment capabilities
    • Cuts materials ranging from hardwoods to plastics, foams, composites, aluminum – even steel
    • Support for 80mm spindles and routers
    • 49″ x 49″ working area with a max Z-height of 5.5″
    • Footprint of 59″ wide and 62″ deep

    ***Not included with your AltMill MK2 4×4***
    Check out our recommended products tabs for an ideal set up, but note the following ARE NOT included with your order:

    • Computer or laptop
    • Spindle
    • End mills or bits
    • T-tracks
    • Waste board (e.g. MDF 2ft x 4ft sheet)
    • Set of metric Allen keys, standard bits or drill for assembly

    ***Some photos may contain items for illustrative purposes, such as spindles, caster wheels, t-tracks, or additional shelving. There may also be cosmetic differences between the machine in the photo and the production version of the AltMill.

    New CNC users, Read these Resources to Ensure a Successful Start. When assembling the AltMill, use the Resources as well as the assembly video for a successful start. The assembly resources have up-to-date information.

    Additional information

    Weight 76 lbs
    Dimensions 38 × 11 × 12 in
    Include Spindle and Dust Shoe Kit

    Include Spindle and Dust Shoe Kit, Machine Only

    origin-criterion

    C

    Machine Specifications

    Specifications

    • Rigid frame and linear motion design using HGR15 linear guides and ball screws on all axis mounted to a custom-designed, machined aluminum extrusion
    • Closed loop stepper motors for over 600IPM
    • Support for 80mm spindles and routers
    • 49″ by 49″ working area with a max Z-height of 5.5″
    • Inductive sensors for homing included
    • Sturdy metal legs with the ability to add 4ft wide shelving underneath
    • Footprint of 59″ wide and 62″ deep

    Must Have Add-on: 1.5kW, 2.kW Spindle or 2.2kW ATC Spindle

    Unlock the full potential of your AltMill with a 1.5W or 2.2KW ER Spindle and Dust Shoe Kit, or, an Automatic Tool Changer Spindle Kit

    Each 1.5KW ER20 Spindle & Dust Shoe Kit comes with:

    • 80mm Dust Shoe
    • ER20, 80mm, 1.5KW 110V Air-Cooled Spindle
    • 110V, 1.5KW, 3-Phase VFD
    • AC power cable and 5m spindle power cable
    • ER20 1/8″, 1/4″, 3/8″and 1/2″ collets (one of each)
    • Data cable to connect to the AltMill/SLB-EXT controller for remote speed control

    Each 2.2KW ER20 Spindle & Dust Shoe Kit will come with:

    • 80mm Dust Shoe
    • ER20, 80mm, 2.2KW 220V Air-Cooled Spindle
    • 220V input, 2.2KW, 3-Phase output VFD
    • NEMA 6-15P AC power cable and 5m spindle power cable
    • ER20 1/8″, 1/4″, 3/8″and 1/2″ collets (one of each)

    Each ATC Spindle Kit comes with:

    • 2.2kW ATC Spindle
    • ATC Spindle Mount
    • Enclosed 2.2kW VFD and Mount Adapter
    • Clear Cut Dust Shoe
    • Tool Length Sensor
    • ATC Expansion Board for an SLB-EXT Controller
    • 2.2kW VFD NEMA 6-15P Power Cord
    • 10m Length 8mm Air Line Tubing
    • Male ¼” NPT to 8mm Air Line Push Fitting
    • ER20 Collet Wrench

    **Each ATC Spindle Kit comes with a variety of tool holders, collets or racks (or no rack.) Read for more details.

    FAQs

    Choosing an AltMill vs a LongMill

    Payment

    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.

    Power Requirements

    Altmill with the 1.5kW spindle. We recommend allocating 2x 15A, 110V/120V circuits — one for the spindle, the other for the machine and a computer.

    • The AltMill consumes 500W and runs off a 48V 10A power supply, 110-120 volt circuit
    • The 1.5KW Spindle Kit consumes 1500W at max load, 110-120 volt circuit

    Altmill with the 2.2kW spindle. We recommend allocating 1x 15A, 110V/120V & 1x 20A, 220/240 Circuit — one for the spindle, the other for the machine and a computer.

    • The AltMill consumes 500W and runs off a 48V 10A power supply, 110-120 volt circuit
    • The 2.2KW Spindle Kit consumes 2000W at max load, 220-240 volt circuit

    If you live in a country with 220V/240V power you must use a transformer to convert to 110V/120V.

    • To solely run the machine, you need a rating above 500W
    • To run the machine and 1.5kW spindle, you need a rating of 2000W

    Altmill Power Supply Specifications: Input: 100-130 VAC 50/60 Hz, 7-54 Amps, Output: 48 VDC 10 Amps, 480 Watts

    International Shipping

    We do not have distribution centers but we ship internationally from our office via UPS.  Shipping costs vary from $300  to $1900 USD. You are responsible for any taxes, duties and brokerage fees.

      • HS Code 8465.91
      • Carton Sizes and weights
        • Package 1, 62x16x11 (in) 70 lbs (X rail box)
        • Package 2, 62x16x11 (in) 70 lbs (Y rail box)
        • Package 3, 37x10x11 (in) 65 lbs (Main box)
        • Package 4, 15x13x5 (in) 20 lbs (Spindle kit)

    3rd Party Spindles

    I would like to source my own spindle, what should I be aware of?

    • For spindles 2.2KW or above, you will need to install extra 220VAC wiring
    • The AltMill comes with an 80mm spindle mount, we do not have larger diameter mounts at the moment
    • The VFDs that may work with our controller are: Huanyang v1, Huanyang P2A, Yalang YL620, H-100, and GS20, however they are not plug-and-play — read this article for further information

    More Information

    Check out our comprehensive FAQs for prospective customers, addressing questions such as power requirements, spindle sourcing, and bundle deal info. 

    Warranty

    The AltMill 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 AltMill 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 accept returns for AltMills that have already shipped.

    General Warranty and Limits of Service:

    Effective March 11, 2024

    Throughout this policy the words “we”, “us” and “our”, or “Sienci Labs” will be used to refer to Sienci Labs Inc. herein and “AltMill” or “machine” will refer to Sienci Labs’ Sienci AltMill. 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 AltMill (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 one hundred and twenty (120) 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 AltMill 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 AltMill 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 AltMill 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.

    Assembly Instructions & Help Resources

    Get Inspired

    169 reviews for AltMill MK2 4×4

    4.8
    Based on 169 reviews
    5 star
    85
    85%
    4 star
    8
    8%
    3 star
    4
    4%
    2 star
    1
    1%
    1 star
    1
    1%
    1. Rhonda Wineman (verified owner)

      the product is well worth the price

      (0) (0)
    2. Adam K. (verified owner)

      A couple of small QC hiccups but the customer service to remedy the issues was fantastic! I’ll definitely be a repeat customer!

      (0) (0)
    3. Robert (verified owner)

      It’s definitely a sturdy rigid machine. I do run into errors though I am trying to work out

      (1) (0)
    4. Josh (verified owner)

      works well

      (1) (0)
    5. Daleon A. (verified owner)

      No problems

      (0) (0)
    6. Ryan (verified owner)

      Vertically adjustable legs would be great for uneven/sloped floors.

      (0) (0)
    7. Wanjoo Kim (verified owner)

      Poor, incomplete, dated instructions. Missing parts (4 bolts for leveling pads – sent email regarding this – no response, no apology). Poor customer service. Faulty SLB-EXT board took a week to get here (should have been sent overnight). No instructions as to how to reinstall and to look out for changed parameters like spindle speed – first carve began without spindle rotating – broke $60 bit). This has caused serious production delays on our end. New SLB solved connectivity but spindle does not come on. Called and left a message for assistance. No response. Sent email. No response. Very disappointing. SLB-EXT case too tight. All the cables have to be jammed in to get the clear cover to close. Wire management lacking.

      (0) (0)
    8. Kevin Keim (verified owner)

      The machine is a game changer for me. Some updates I think you should seriously consider is diagonal bracing for the 4 sides. Also some simple 3d printed holders for the zero plate and wrenches.

      (1) (0)
    9. anthony (verified owner)

      In simple terms – exactly what I was looking for! The size is perfect for the majority of my projects, with the ability to tile on a machine like this and cut a full 8′ x 4′ sheet is perfect.

      The simplicity of assembly is amazing (not actually that difficult to build alone). The aluminum extrusions provide a solid base to customize and build out a solid storage or other below table solution. I was able to design and integrate a custom table extension, front and back for the previously mentioned 8′ tiling options. As well as include multiple large drawer storage and flat stack solutions.

      I opted for both the 1.5kW spindle and G-sender computer options, hands down totally worth it! I appreciate the flexibility in mounting and locating the control computer. Ended up locating the CNC sideways along my back wall for plenty of extension room front and back of the machine and mounted the swing arm and computer to the side wall (not on the machine leg per typical). This provides a ton of versatility I was looking for.

      Setup and configuration was far simpler than expected, well thought out design and engineering for this price point of a CNC with this level of capabilities. User interface of the G-sender control software, hands down, second to none for a new user or more than powerful enough for a veteran CNC shop.

      One upgrade I would appreciate on the software side would be the outliner function. The ability to have this function is amazing and is very useful for visual confirmation of clearances, cut area and potential issues. The current execution of this function could use an upgrade in my opinion.
      I would love to see two options for the outliner function

      1 – Total project scope area outline
      – Actually outline the true boundary of the project outer most extents.
      – currently the outline follows the tool path to the furthest extents and cuts the corner back to 0,0,0 at the end of the tool path.
      – Update to have the tool follow the actual max extents of the total cut area extents.

      2 – individual boundary outline
      – Run a single high-speed pass outlining every exterior boundary line
      – Think flat pack cabinet project with multiple nested objects, run the outline to understand where you could locate a screw or hold town or just understand what you laid out on the board will actually do what you expect the CNC to do.

      High points:
      – Machine is great!
      – Quality is high (as expected based on research of the company and product reviews)
      – Performance is amazing (especially at this price point)
      – Easy and intuitive to understand and use

      Basically, exactly what I’ve been looking for and waiting to hit the market for the past several years!

      Thanks for an amazing machine and keep innovating!

      (0) (0)
    10. David Lehman (verified owner)

      Easy to put together. Forgot to take the cable carrier out of the X axis extrusion before mounting. It’s difficult for an old man to lift it once the Z axis is mounted, but that was my fault. Everything else went fine. This is a solid machine and I am very pleased.

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

      It feels like this machine is half finished. Some parts are well designed and well built, and others feel like afterthoughts or parts that were half-done when they decided to launch. It works, but there’s plenty of places where you’ll be assembling and go “…they did it like that? was it Friday afternoon or something?”

      (0) (0)
    12. Paul Hammerschmidt (verified owner)

      Great product, very high quality!

      (0) (0)
    13. Cesar V. (verified owner)

      So far so good. Started with an xcarve upgraded to Onefinity, and now upgraded to AltMill. Loving the rigidity. This thing is impressive. I did have some problems with customs during delivery. CS helped more than required. Great experience. Thanks guys. Looking forward to what you guys have in the future

      (0) (0)
    14. Donald K. (verified owner)

      This was my first CNC and I learned a lot. The online support tools are great, but I feel could improve with a better search function. Also, I mangled a few pieces when I first started to move the gantry. Just needed a little more details on proper startup routine. Other than that, this is a really well designed and built tool.

      (0) (0)
    15. Tim F. (verified owner)

      Love the everything about the machine has been wonderful setting and learning as a new CNCer.

      (0) (0)
    16. Konstantinos Barmpounis (verified owner)

      The best CNC in the prosumer category—nothing else comes close. Fast and rigid and fully capable of production work. I would like to see some minor improvements in the future but considering the price of the machine this is already close to perfection.

      (0) (0)
    17. Jack Scott (verified owner)

      An excellent CNC.

      (2) (0)
    18. Matt Q. (verified owner)

      The set up of the machine was fairly time consuming (about 10 hours) but pretty easy if you’re good at fallowing instructions. Felt the price point was great for the product I received.

      (2) (0)
    19. Edward Ytuarte (verified owner)

      I shopped around and liked this CNC and it’s price.

      (0) (0)

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