Y-axis MGN12H Linear Rail Guide Kit 3.0 for Ender 3 S1 and S1 Pro 3D Printers Upgrade Include Heated Bed Support Plate and Custom 4020 Profile Accessories from ChowThink

The installation was easy and all the holes on the linear rails were tapped. Its way better than the enomaker one but there are still some issues. They didn't remove the metal after tapping the holes. So if you shake it or they just come loose there are meral shards on the ground. Knowing that you could try your best to clean it but they don't all come out. The screws are too long and I worry that they touch the Y axis belt so I sanded them down just a teeny bit. I don't know if they can ship out with shorter screws but thats a fix. The holes for the y axis stepper motor/endstop the 2 big ones stopped tightening for me after a little bit. Now if unscrewing and screwin less than 10 times (I'm being generous because I don't know how much I've done it) will make the tapped hole not work anymore kind of a deal breaker. All in all these issues are worth it after dealing with enomaker and theor y axis rail. I found a workaround to sill have a tight endstop as well.

I finally installed this y-axis bed and rail today and have been printing with it all day with no issues. I did a PID heat bed tune, followed by a bed leveling and all is working great. I did put some more oil on the rail before installation. The install was easy, except for putting the clamps on the end of the belt. No real instructions for doing this part, and I'd never done it before. This probably took me longer than doing everything else combined. The bed itself is red in color and looks great against the black printer parts and it was just as level or better than my stock bed which in my opinion was great.

There was one extra screw to attach the linear rail to the lower support but no screws to attach the supplied bed frame to it. There were two large screws for some unknown purpose and no screw at all long enough to trigger the y endstop. On a side note, there was no mention of orientation of the bed frame. If you put it on wrong it won’t clear the motor.

Something with the different support beam causes rubbing on the y belt unless tightened to the extreme.Any slack causes it to rub somewhere and make awful noises and vibration.Don't know if it is a QC issue, will monitor and update.

I purchased the y axis kit for my ender 3 s1 pro. I installed the kit pretty easily except for the belt, the belt came with weird half clamps and belt itself isn't the same quality as a gates belt like the machine came with. The belt that came with kit broke within first print leaving me dead in the water. I messaged them and they gave me a refund enough that covered a roll of the gates belt like machine came with. I have printer going now it seems to be printing nice but the rails are definitely louder than the wheels. I added some white lithium grease to the track and the wheels but it didn't quieten it down any. I'm hoping maybe it will loosen up and quieten down some after it's ran awhile. But I'd say it's still worth the price for the linear rail, carriage, bed plate, and the 2040 rail you get with it. I'll update my review if anything changes.