I was using a 3018 to 3040 converted machine for a couple years, and was absolutely plagued with the amount of play in everything, resulting in chatter and poor tolerances and etc. This unit is SO MUCH more solid than the units that run on tubular rails and move the workpiece up and down on the Y axis.Within the first hour of milling, I had a problem: The power wire to the motor burned. It turned out upon autopsy that one of the leads of the main power wire had been severed inside the insulation (and within the drag chain), probably during manufacture rather than just an hour of operation. That began arcing, the arcing melted the insulation as well as the neighboring wire's insulation, and the two shorted.I contacted SainSmart and they were very responsive, immediately shipped me an entire replacement drag chain assembly and a couple other parts that could have potentially been damaged due to the short, and followed up about how it worked. Definitely very well supported - the exact opposite of the first machine I used.In my opinion, if any one thing could be seriously improved (including by the user), it would be this main power wire. It's maybe 18ga in less-than-flexible insulation, and I would replace that with about 14ga flexible wire in silicone insulation plus an outer jacket. But I haven't had any issues with the replacement wire - I just think that could have been a bit better designed, and could be improved by you in your shop very easily. The drag chain has lots of extra space - mine is now also home to a small poly air line, as well as a 120vAC tool cord for the router, so you can stuff other lines of different types through the drag chain as needed, rather than having them dangling around the work area.If you've never assembled any desktop CNC before, you might think this is a pain to assemble. It's not. I was done in maybe 2 and a half hours. A surprising number of parts actually come pre-assembled, so that you only have to do maybe half or a third of the actual assembly in your own shop. I used a lot of thread locker. I don't know that this is necessary, but the fasteners are going to take a lot of vibration, so it's probably a good idea.It's been a pleasure to use. I've used it with the included 300w 48vDC spindle which is very good, a >1HP router, and a 10w laser. The machine has performed exceedingly well all the time. There's SO much more force in the stepper motors than the little 3018 devices (and the torque clutches have much, much higher thresholds), it makes milling completely different. I've milled soft woods, hard woods, acrylic, and a lot of aluminum on this so far. I expect I could probably mill some mild steel with a good carbide bit and a lot of patience, but I haven't tried that yet.I also added some little cardboard flaps on the left and right sides to keep dust and chip out from under the roller wheels for the Y axis. I don't know if they'd have issues rolling over debris, but it could potentially raise the gantry and mess up your Z axis, so I think it's probably smart to cover those with some dust deflectors.

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I bought a Genmitsu PROVerXL 4030 in late 2022 as my first CNC Routing machine. I am an experienced (hobby) woodworker with nearly 40 years of experience using traditional woodworking equipment. The CNC machine was added to expand my project capability.The Genmitsu was an excellent choice because it allowed me to start small (300mmx400mm cutting envelope), but expand to 600x600 or 1000x1000 for a modest additional investment - using many of the parts purchased with the original 4030.I encountered a few minor challenges along the way in both hardware and software. At about 11 months my spindle motor started acting badly, needing a gentle spin to get started. When discussing this with a SainSmart Tech, without prompting, he said that it should not be doing that and offered to replace it under warranty - which they did.In year two, I had a problem with 3D relief programs stopping in mid-run for no apparent reason. The SainSmart Tech identified a few things that could be causing the problem, but suggested that I also change my G-code software from Candle to UGS. That change solved my problem.Overall, I've been very happy with the 4030 machine. When I wear out the machine X-Y lead screws, I'll use that as an excuse to upgrade to the 600x600 machine. But, I'm even more happy with the after purchase support provided by SainSmart. They respond promptly to questions, provide excellent technical input and follow-up to assure that problems are corrected to your satisfaction. I can highly recommend both Genmitsu and SainSmart.

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