SainSmart Genmitsu 4040-PRO MAX CNC Router, 710W Trimmer & Linear Rail Driven, Work Area 400 x 400 x 78mm, for Wood Metal Acrylic Cutting Milling, GRBL Control
$129.99
Related Products
Product description
1 Next-gen Precision&Power
2 User-friendly Design
3 Easy Assembly
Upgrade Your CNC machine with Compatible Accessories 
Compatible with 4040-PRO Y-axis extension kit/4th-axis rotary module kit/dust shoe, etc. (Please note that 4040-PRO X-axis extension kit is not compatible) Additional upgraded accessories are available to order, tailoring your machine’s capabilities to your needs.
Wide Spindle Compatibility 
Includes a 65mm spindle mount and 52mm spacer for easy router or engraving module upgrades. To accommodate a variety of spindle motor diameters, additional mounts are available for purchase to ensure a seamless fit.
4040-PRO MAX
Comparison Chart
400 x 400 x 78mm
Working Area
400 x 400 x 60mm
Linear Rail
X-axis Drive System
Belt
Linear Guide Rail
Z-axis Drive System
Lead Screw
710W Trimmer Router
Spindle Moter
775 Motor
6500-30000
Max RPM
10000
4th Axis Support
MPG Support
400 x 400 x 78mm
Working Area
400 x 400 x 78mm
Linear Rail
X-axis Drive System
Lead Screw
Linear Guide Rail
Z-axis Drive System
Lead Screw
710W Trimmer Router
Spindle Moter
775 Motor
6500-30000
Max RPM
9000
4th Axis Support
MPG Support
400 x 400 x 78mm
Working Area
400 x 400 x 76mm
Linear Rail
X-axis Drive System
Belt
Linear Guide Rail
Z-axis Drive System
Lead Screw
710W Trimmer Router
Spindle Moter
775 Motor
6500-30000
Max RPM
9000
4th Axis Support
MPG Support
Other 4040 
4040-PRO 
4040 Reno 
Explore More
PROVerXL 2X2
It delivers industrial-grade accuracy with closed-loop motors, a 2′ X 2′ working area, and a powerful 710W spindle. It’s a perfect fit for makers, pros, and small shops.
PROVerXL 4030 V2
It is a versatile and affordable tool with precision and improved features, including a closed-loop motor and ball screw, to bring your creative ideas to life. Running speed up to 5000mm/min.
PROVerXL 6050 Plus
Default with a 300W spindle, all-metal frame, and Dual HG-15 Linear Rails for precision. Easily configurable with various accessories for versatile projects.
PROVerXL 4×4
Featuring a spacious 1300x1300mm work area that supports dual Z-axis, it’s ideal for precision work with top-tier safety and precise performance.
Compatible Accessories
XZ-Axis Extension Kit
Upgrade your Genmitsu 4040-PRO or 4040-PRO MAX with this precision-engineered X-axis extension kit and expand your working area to X-600mm x Y-400mm (23.6” x 15.7” x 3.1”).
XZ Axis Module Upgrade Accessories
By using a lead screw and linear rails, the Z axis provides superior vertical motion stability, reduced vibration, and repeatable positioning accuracy of ±0.005mm for intricate carving.
4040 Aluminum & MDF Hybrid Spoilboard Table
This upgraded MDF Hybrid Spoilboard, backed by aluminum, ensures unmatched load-bearing capacity, preventing deformation even during intense CNC milling.
Upgrade Aluminum Bench Vise Clamp
Four columns and 2 clamps with groove lines, make the bench vise clamp easier and more stable to clamp uniquely shaped things, especially for holding cylindrical objects.
1.25 HP Palm Trimmer Router Kit
1.25 horsepower motor and a 6-level variable speed range spanning from 10000 to 30000 RPM, this compact trimmer router tackles soft or hard wood with ease.
iMaticBox Relay Module Switch
The iMaticBox achieves synchronized start and stop control according to G-Code for CNC machines and their external accessories, such as a vacuum cleaner, trimmer router, laser, etc.
Next-Generation Precision: Advanced X-axis and Z-axis linear guideway structures for enhanced motion stability and precision.
Powerful Performance: Equipped with a high-powered 710W compact router for superior engraving and cutting.
Compact Work Area: Features a 400 x 400 x 78mm working area, ideal for detailed and intricate tasks.
High Production Efficiency: Reduced machine vibration ensures high precision and stable motion during fast, high-power operations.
Integrated Dust Plate: Minimizes maintenance costs and extends the machine’s service life.
10 reviews for SainSmart Genmitsu 4040-PRO MAX CNC Router, 710W Trimmer & Linear Rail Driven, Work Area 400 x 400 x 78mm, for Wood Metal Acrylic Cutting Milling, GRBL Control
Add a review
$129.99
Matt –
Very Accurate CNC!!!
The Goods:The assembly was very quick and easy.After doing a through review and calibration check of the X, Y and Z axis. I found this machine to be very accurate (~.01mm) with minimal backlash! This CNC seems like a very durable and highly capable machine. I will be doing additional testing in the near future. But so far things feel very solid and accurate.The Bads: (but maybe some good…)During calibration and tolerance checks I found that the provided router had a whopping .3mm runout!!! I was able to email support and after providing a short video of the runout they very quickly sent me a replacement at no cost. I was very happy with the support that was provided from Sainsmart to quickly resolve this issue. The new router is well within acceptable tolerance and will allow me to continue testing.So far, I am very happy with my purchase and it seems like a very capable CNC for the value.
V. Novak –
Great after solving initial problems
Received this item July 3rd, 2025, but held off on review because of problems encountered with limit switches and gSender software.First, limit switches. After a successful setup and a few test runs, the x-axis limit switches locked in tripped mode and Homing failed to work. Contacted Amazon for help and they informed me that I must contact Genmitsu direct and contact them (Amazon) again if Genmitsu failed to solve the problem. The Amazon agent promised to follow up in a week, but FAILED to do so. In the meantime, I contacted Genmitsu (Sainsmart) via email as they are in China and several hours behind us. They were cooperative but did not have a resolution. However, they did offer a replacement or refund if I wanted to return.I decided to try to resolve the problem myself and traced the circuit to the circuit board mounted to the rear of the X-axis. By disconnecting and reconnecting the connector for the x-axis, the problem went away. The unit then worked great but after a bit the circuit failed again. This happened a few times with reports going back to Sainsmart each time. After carefully squeezing the pins on the connector it seemed the problem was corrected. In the meantime, since I was willing to troubleshoot on my own, Sainsmart sent me a package of spare parts for free. It took a few weeks, but it’s working fine now.Second problem. I used gSender version 1.5.1 to control the cnc because I prefer the interface over UGS which is supplied with the unit. The problem was that the machine would only run for a minute or so and then Halt. Sainsmart was not able to help with this problem so I did some experimenting using other software and and found the the same gCode running on Universal gCode Sender (USG) ran without a problem. Turns out, gSender defaults to grblHAL if it doesn’t recognize the machine and the Genmitsu only recognizes grbl. Switchint gSender to grbl solved this problem.At first, I was quite upset with my purchase, but am happy with my 4040 Pro Max after resolving my problems. Actually, I learned so much in the process that I am kind of glad it happened this way.Amazon is usually helpful in solving problems, but in this case they flopped and Sainsmart was the winner.
Joey G. –
Great product
Good product…took some time to figure out and get use to but I will say customer service is amazing…product works great when you know how to use it
Alvin R. –
Problem with Y axis cabling
The machine was well packed and the machine itself seems to be well made. I had an issue with the Y axis cabling from the rear profile connecting to the Y axis motors. It appears to me that the cabling within the rear profile is not correct. So, I’m stuck at that point in the assembly and the biggest concern is the support model provided by SainSmart is terrible. I’ve been waiting on some guidance for two days now and if I can’t get this resolved soon, it will be returned. If a resolution is provided, I’ll update this review with additional comments.SainSmart support responded three plus days after support issue was raised. Support told me to reverse the orientation of the rear profile such that the cabling was reversed. While this makes sense to correct the problems with the cabling, additionally, the rubber feet installed in the rear profile will need to be removed and installed on the opposite side not designed to accommodate the feet. This should work but this was an assembly problem from manufacturing and a better solution would be to send a new rear profile with proper cable orientation. It would also be better if SainSmart had a “new install” support process to minimize delays on problems such as these.After several days of working on a variety of problems and several interactions with support, I’ve decided to return the product. The machine keeps throwing alarms and stops operating. Initially the problems began simply starting to home the device, the controls became inoperable and I was able to clear the alarm with the $X grbl command but it always returned to the same type of problem either homing, jogging or running a job. I’m giving up on this machine but I plan to order a SainSmart replacement and try again.
JohnG –
Great CNC Machine for the money!
I purchased this machine a couple of months ago and other than testing it briefly, just got it up and running. I previously had another machine that gave me all kinds of grief so this is my second machine.WHAT A DIFFERENCE! This tool is way more stable and smooth. Some people seem concerned with the smaller stepper motors but I have not had any issue with them cutting anything of reasonable size so far. The spindle motor is a beast compared to my last one. It is so smooth and powerful that I purchased a hand held router kit made by the same company that uses the exact same motor. (I will review it later).The machine came very well boxed and packed. Assembly was easy as it came as mostly assembled modules. All of the tools required were included as well as a few accessories. The included software was pretty typical of any of these machines but certainly adequate to get started carving.I am SO glad that I spent the extra money to get the pro MAX version of this CNC machine. It was well worth the money!
Elmira –
I’m honestly very happy with my purchase. The build quality is solid, and the precision is impressive. Setup was relatively straightforward, and the manual was helpful.What really stood out to me was the customer support. Every time I had a question or ran into a minor issue, their team responded quickly and professionally. That level of support gave me a lot of confidence in the product.If you’re looking for a reliable CNC machine with excellent support, I highly recommend this one. Totally worth it.
nikodemo –
Ottimo prodotto, macchina CNC di qualità eccellente per uso obbistico e semiprofessionale, robusta, imballaggio eccezionale…consegna nei tempi previsti, cinsigliata
MartenT –
Really like the build so far, still in assembly as I decided to go for Y-axis extension from start. I placed my order after getting some good advice from SainSmart Customer Service.Swift delivery.Had a small hick-up during assembly but had contact with Customer Support and they promptly solved the issue straight away in a very nice and knowledgeable way. thumbs up!
Lloyd Davage –
Excellent machine, easy set up and easy to get to your first carving.
Michael Kreuter –
Bin mit dem Artikel zufrieden.Bei Nachfragen Hilfe von dem tollen Sain Smart Support Team schnell und zuverlässig erhalten