MGN12 Linear Rail Precision Motion Kit for Ender 3 S1 / Pro (Y-Axis)

Regular price $119.99 | Save $-119.99 (Liquid error (sections/product-template line 234): divided by 0% off)

  • Upgrades the Ender 3 S1 / Pro Y axis linear motion system for superior performance
  • Eliminates backlash and wheel binding to improve the overall print quality
  • Supports both single and dual rail configurations for maximum bed stability
  • Steel MGN12 rails and ball bearings reduce maintenance due to low wear and tear

Estimated Delivery Time is between and .


The MGN12 Linear Rail Precision Motion Kit is a complete Y-axis upgrade for the Creality Ender 3 S1 and Ender 3 S1 Pro.

Linear rails (or guides) are the preferred choice for many industrial applications. Manufactured to tight tolerances, they offer superior performance with greater precision and accuracy. The rigid stainless steel rails allow little to no flex, and with proper lubrication, the 3/32" ball bearings are remarkably smooth and quiet.

To introduce rail compatibility on the S1 series, we've developed a complete Y axis upgrade which replaces the original closed face extrusion. At the core of this product is our custom Baux Bar, a 2mm thick aluminum beam which supports multiple linear rail configurations. Factory anodized black, it seamlessly matches the S1's aesthetic and appears as though it were stock part.

MGN12 Linear Rail Precision Motion Kit for S1 / Pro - Assembly Guide



The MGN12 Precision Motion Kit offers two possible linear rail configurations.


Single Rail


The standard choice is a single MGN12 linear rail, centered on the Baux Bar for equal weight distribution. This provides excellent stability and maximum performance, where minimal preload allows the bed assembly to move freely. This is our recommendation for most S1 and S1 Pro 3D printers.

Dual Rail


Adding a second MGN12 linear rail is optional (not included). Mounted in parallel, the weight is distributed across a wider distance for even greater stability, ideal for heavier cast aluminum heated beds and / or glass plates. However, dual rails require precise alignment or they can introduce binding and impede the movement.


Package Contents

The MGN12 Linear Rail Precision Motion Kit comes with the following parts. Certain items can be removed using the provided options.

  • (1x) Modular 3-Point Y carriage plate
  • (1x) 300mm MGN12 linear rail
  • (1x) Baux bar
  • (1x) Belt tensioner bracket
  • (1x) Stepper motor bracket
  • Mounting hardware



The MGN12 Linear Rail Precision Motion Kit is compatible with the following 3D printers.

  • Creality Ender 3 S1
  • Creality Ender 3 S1 Pro



Customer Reviews

Based on 4 reviews
Another Great Kit

After installing the X axis kit and being extremely happy, I purchased the Y axis. The instructions were easy to follow and i no longer have a wabbly bed or have to wonder if the wheel is tight enough. This kit also made it quieter which is always a plus. Now having the X and the Y axis, I can see an improvement in my prints. Recommend this kit to anyone that is on the fence about getting it.

John Kronenwetter
Great Product!

I purchased a Y axis linear rail and carriage. The instructions were super easy to follow and it was easy to install. Both products were machined very well and run flawlessly. I will purchase from this company again for sure!

Charles madden
Best y rail kit hands down and awesome customer service.

Not many choices out there for the S1 rails right now but I am happy I came across this company. Not only is this not just a rail kit it's a whole new setup. Super smooth on the dual rails and super quite. Perfect upgrade if you are running a Klipper setup. Can't imagine it would hurt on a marline either. Not only is thr product great but they stand by their products and customer support is superb. You won't regret your purchase. Looking forward to the x rail kit in the works!!! Thanks guys.

Nolan Blackhurst
Gulfcoast parts are suburb, linear rails not so much

I just installed my kit three days ago and have run several prints now. First, I'll say that all the Gulfcoast parts including the baux bar and y-carriage have flawless machining and precision, along with a beautiful finish. I gave everything a good look over with my starrett machinists square and it is all very flat and square. The parts installed easily and cleanly onto my ender s1 pro with no issues. My one big complaint though is the grade linear rails that came with it. They are gritty, the machining is rough, and I don't anticipate them lasting very long. I already have some Hiwin rails on order (I also bought the s1 x-axis kit which also came with a horrible linear rail) to replace the scrap steel rails. If you buy this kit do yourself a favor and order some proper rails somewhere else. If Gulfcoast sold good quality rails with their kits as an optional upgrade I would have gladly paid for it.



Gulfcoast Robotics ships Monday through Friday, excluding holidays. The shipping cut-off time is 11 A.M. Eastern Standard. Orders placed after the cut-off time will be shipped the following business day. All orders are fulfilled by our warehouse located in North Port, Florida (US).

Domestic Orders

Domestic orders are shipped via USPS using the service selected at checkout. Parcels that exceed the First Class weight limit of 15.9 oz will automatically use Priority Mail. Once your package has been processed, a Tracking Number will be provided. The Shipping Confirmation is sent via e-mail and/or SMS alerts, depending on the contact information specified at checkout.

International Orders

All orders shipped to a destination outside of the United States are subject to the import duties, fees and taxes of the destination country. Delays in delivery may occur if your package is randomly selected by the Customs Department for inspection.We have no control over the process or additional charges associated with the delivery and important of your package into your country. We do not benefit in anyway from these charges and work closely with our carriers to ensure as few delays as possible.We are not responsible for any duties, fees, or taxes that are incurred during the delivery of your order/package.

MGN12 Linear Rail Precision Motion Kit for Ender 3 S1 / Pro (Y-Axis)

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