Genmitsu Upgraded Aluminum Z Axis Assembly V2 Kit, with Spindle Motor Mount for 775 Spindle and 300-500W Spindle, 43mm & 52mm Diameter Spindle Holder for CNC Machine 3018-PRO

Works verry well, Excellent quality and workmanship. Made my 3018 pro a better machine I mounted a RATTMMOTOR 500W Sindle motor to it, Only disappointment is I lost some engraving area on X axis which I will recover by extending the axis and installing a longer lead screw, Don't know why they did not machine the holder to allow all the movement needed like the original holder has. Only other problem was the z axis was reversed, Easel was able to reverse that in machine set up. Overall verry please with the spindle holder, I would recommend this product.

High quality upgrade.

Muy buen material excelente

Perfect! Rigid, stepping to new class!

Overall this product appears to be well made. It is much more substantial than the stock spindle mount and the bearings appear to be higher quality - the X-axis operates much more smoothly than the stock mount. Two nice features are the Z-axis manual adjustment knob and the built-in z limit switches.As others have mentioned this is a little wider than the stock mount so you lose a little bit of x travel. The spindle appears to mount lower and farther forward than the stock mount requiring the gantry to be moved all the way to the back of the side rails (3018 Pro). With the spindle mounted lower the lower limit of the Z-axis is the bottom of the aluminum bed - if you add a 3/8" MDF spoil board your z range is about half of the physical z range. The other annoying issue is the z-axis is wired backwards - up is down, and down is up - making me wonder if this will even work in the stand alone mode without rewiring (others have indicated that Easel will fix the problem, but I haven't tried that yet.)

Why not make it the same size as the original but on aluminum? Yes it's solid but we end up loosing cutting height and length, the anti backlash is made in a way that one of the 2 pieces needs to be loose in order to work, if you screw both tight the leadscrew cannot rotate so I have no other choice but to leave the smaller piece loosen, and last but the most important thing is that it didn't came with the endstops cable and I cannot use the original one since is soldered to the board and no matter how much I have look for it I cannot find an endstops cable to purchase, so at this point I have an expensive paper weight in my hand.

My original unit had a tolerance issue. Deflection that was unacceptable under load. Sainsmart became aware of the problem and contacted me before I could request help. We discussed the issue and how I verified it, with a video of the issue, all within about an hour of first emails. They had a new unit shipped immediately free of charge. It arrived quickly and best of all it completely remedied the issues and improved the stability and quality of the work.When it works it works very well, when it doesn't work they work with you to make it right. Not much more you can ask for.

This is pure garbage. The bearings have a ridiculous amount of play. After 30 hours of run time its louder than the original prover carriage. Then the bearings fail and create unusable amounts of play. When you go to press them out and replace with quality ones you learn that both the z and the x carriage's bearing pockets have internal shoulders which prevent one from pressing them through. They are also pressed flush with the shoulder preventing any tool from gripping the bearing sleeve and pulling them out.31 days in and i have 110 dollars worth of blue aluminum paperweights and a possibly salvageable stepper.Avoid this like the plague. Ill NEVER buy another sainsmart product except maybe router bits after this debacle. The fact that they'd make non servicable bearings and not choose to use quality ones up front says all you need to know about their ethos.Now i have to start from scratch. Thanks sainsmart!