Description
***Included with your AltMill MK2 4×4***
- SLB-EXT controller and emergency stop
- Partially pre-assembled rigid frame
- Inductive sensors for homing
- Sturdy metal legs with the ability to add 4ft wide shelving underneath
- Welcome package
***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.
Lead times
This product has a potentially long waitlist, relative to demand and seasonality. For more info on expected shipping and delivery times, please see our Order Status page.














Neil S. (verified owner) –
This has been a great machine so far. I have only scratched the surface of its capabilities.
Daniel C. (verified owner) –
The machine went together quickly and everything fit as described. I’m still setting up the area under the machine so I haven’t used it other than to manually run to the different corners and check out the basic functions.
Chris Wineland (verified owner) –
Very robust machine, only thing i wish could be different would be it shacks alot, almost afraid of it coming apart.
Charles Blaker (verified owner) –
Excellent CNC machine, can’t say enough good things about it. I have been using my Altmill 4 x 4 for about a month now and have made several successful projects along the way. I did have a couple of challenges up front after the assembly, but they were quickly resolved, one on my own, and one with the exceptional assistance from the Sienci Labs team. It should be noted that both of those challenges were user error – me being in a hurry. The assembly was challenging, but the video helped to make sense of it all. I did miss one step some how and installed the sensors wrong. I didn’t catch the edit that described inserting the sensor into the bump stop, I originally installed them in a different hole. Your support team pointed that out to me when I sent them a picture. All is good, I am very happy with the machine.
Francisco Baez (verified owner) –
Price is good
Kelly T. (verified owner) –
Working great!
Jean Davenport (verified owner) –
Overall I am happy with my purchase. For anyone considering buying the Altmill, be prepared to spend a great deal of time educating yourself on building, setting up, installing, and add-ons that you may need to consider.
Inevitably, there will be issues and you will need to learn how to navigate through the forums and help links. Be patient and keep an open mind with the software issues; my suggestion is to visit the forums and get familiar with the issues posted and how to search and resolve those issues and spend less time trying to fix those bugs and think… I remember reading about that somewhere.
The major consideration in selecting this CNC over others was the variety of resources on Youtube and the Sienci website. The Sienci support team was available and guided me through several issues; some my fault and some not my fault.
If CNC is not your day job, plan for a month to get it up and running.
J
Ron O. (verified owner) –
I absolutely love this machine. It is so well designed and has excellent instructions. I have put many days on my AltMill cutting wood and aluminum and had no issues, it works very well. I would absolutely buy again!
Doug E. (verified owner) –
I have had a LongMill MK2 for 3 years, it has been a great machine to achieve the goals of learning CNC machining. The new Altmill was easy to assemble and video and handbook was easy to follow. This machine was the perfect upgrade to the LongMill 48×30. Customer service was great, just had a small shipping issue but was expected due to the unpredictable circumstances. I’m currently making small projects in order to establish trust with the CNC process. I will move on the larger projects as this trust builds. (Sometimes these machines seem to have a mind of their own.) 😂 Thanks for producing a great product.
Anonymous (verified owner) –
Great sturdy product.
Jim Shigley (verified owner) –
It is obvious that your team has spent a lot of time getting this right, the machine fit together flawlessly, everything went so well, not a single issue. I am very impressed with the machine and how it is built, and the rigidity of it!
Joshua Cole (verified owner) –
I’m a first time CNC user and I have found the Altmill to be a very sturdy quality machine. Only issues I’ve had were due to my inexperience as a new user. There was some damage to one of the Y-rails during shipping but Sienci sent me a new Y-rail quickly. Customer service was top notch. I’m a happy customer
Martin Serre (verified owner) –
I’m not a very experienced CNC user yet, but this machine has already saved me a noticeable amount of time in my cabinet-making work. With more practice, I’m confident it will significantly increase my productivity and allow me to take on projects that would have been complex or tedious with traditional machines. I’m very pleased with its performance—and I’m also looking forward to creating some fun projects for friends and family.
The included software is a major improvement over my previous smaller CNC, and the machine itself is both fast and precise.
Note: To achieve truly professional results, it’s helpful to have a good working knowledge of VCarve and Fusion 360.
Alex Hough (verified owner) –
The setup of my machine was pretty easy. I just followed the online setup video, and the machine was almost ready to use. I had a bad e-stop and had to get them to send me a new one. The part arrived very quickly.
In the meantime, I just disassembled the bad switch and made a jumper wire to bypass the button. Everything worked great.
One thing I found out that I was not initially planning for was dust management. I would highly recommend picking up a dust collector to go along with this if you don’t already have one.
I was able to use fusion 360 to generate my g code and I was off to the races.
I also found that I wanted to be able to do laser engraving and shaper inside cutting than I could get with milling bits. To do this, I picked up a JTech 64w Altmill kit. I’m using fusion to generate Gcode for laser cutting, and I’m using Lightburn for laser engraving.
This has been an awesome pair. I’m stoked that I’m able to make some super cool stuff now in my garage now.
I would highly recommend these machines to anyone looking for a good home CNC.
James Sanders (verified owner) –
I had never created a file, or ran a CNC prior to this.
My purchase was influenced by the on-line tutorials, and I like the idea that the Company and Machine is a product of Canada.
The build video, as well as the introduction videos were/are very handy.
The machine itself is very robust. Very impressed with the operation of it.
My only issue is two of the nuts that secure the axis sensors were cross thread, straight out of the box. These seem to be a queer size, as I haven’t been able to source them anywhere.
Considering all the engendering and programing required to make this machine preform, I’m impressed the only issue is a couple of nuts.
Mike H. (verified owner) –
We are so happy with this machine! It’s highly capable and very quick. So much good design in this machine! This is the 5th high-end hobby machine (including all the big names from the last 15 years) I’ve used, and the Altmill Mk2 is by far the best in capability and performance. It’s amazing how cool the motors remain, even under strong use. Highly recommended! (There’s a good chance I’ll purchase a 2nd one in the near future — no need to consider alternatives.)
Raul Santana (verified owner) –
I’m new to CNC, and the Altmill 4×4 made learning easy. Setup was simple, the build is solid, and the accuracy blew me away. Every carve has been clean consistent and awesome. The community is quick to respond and helpful with beginner questions. This machine along with gsender gave me the confidence to start real projects fast. Highly recommend for anyone wanting a reliable and beginner-friendly CNC.
Daniel Solberg (verified owner) –
Easy assembly, solid machine, runs great. Glad I made the switch to the AltMill.
Ron A. (verified owner) –
Absolutely easy to set up. Documentation really well done.
Paul Stuart (verified owner) –
The machine is very well made. Im impressed with the accuracy. Took me a while to build as being very carefull not to make a mistake. An image legend of the screws, bolts ect. would have helped.
Raymond purdham (verified owner) –
Love this machine
John Lingenfelser (verified owner) –
Machine is the coolest thing I’ve ever owned!
David Bloomquist (verified owner) –
Excellent product. Had issues with some of the motors which Sienci quickly took care of.
Sean (verified owner) –
Still waiting on the 2.2 kw spindle to complete my set up of the machine. I would love to give you a good review but tough to do so when I can only get part of the machine.