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UniTak3D 400mm MGN12 Linear Sliding Guide Rail with MGN12H Bearing Steel Carriage Block X-axis Upgrade Kit Compatible with Creality Ender 3 CoryXY DIY 3D Printer and CNC Machines

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$22.99

$ 11 .99 $11.99

In Stock
  • 【Anti-rust Coating Surface】: Linear Guide Rail adpots blackening treatment on surface to prevent rusting in long-term use.
  • 【Upgrade 3D Printer】: The 400mm MGN12 Linear Rail will upgrade your 3D printer,which can improve print quality and carrying capacity greatly.
  • 【Premium Material】:The linear bearing is made of heavy-duty bearing steel,which is more durability, high stiffness stiffness,high accuracy,smooth running, low noise than others.
  • 【Drop Proof Rubber】:There are 2 black rubber stoppers on the ends of the linear sliding guideway in case the carriage falls off the rail.
  • 【Application】This linear motion rail widely use in Ender 3 series/CR10 series 3D printers, large-scale transmission equipments including industrial robots, cleaning equipment and supporting devices, etc.



Product Description

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What are the advantages of UniTak3D linear guide rail?

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Kindly Reminder:

  • Installation screw size: M3×8mm.
  • The guide rail may have a tolerance of ±1mm,but this does not affect normal use.
  • The mark on the bearing surface is only the mark made by the factory, NOT a scratch.
  • Normally each side is lack of 1 or 2 balls.The carriage block will get stuck easily if it is full of balls, the balls on each side need some room.
  • Needed some light lubricant and to be worked for awhile to loosen up.The longer it is used, the smoother it runs.

Packing list:

1 × MGN12 Linear Rail

1 × MGN12H Bearing

Specification

Material: Bearing Steel
Type: Slide guide rail
Slide Track: Linear guide rail
Accuracy Level: H
Screw Size: M3×8mm(not included)
Length(Optional): (Approx)300mm;11.8inch;350mm/13.7inch;400mm/15.7inch
MGN12H: Basic dynamic load rating:380 C[kgf]
BasiStatic Load Rating: 600C[kgf]
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Q1:How many mounting holes on each rail?

A1: 300mm(12 holes); 350mm(14 holes); 400 mm(16 holes)

Q2:What size and length screws do I need to mount the rail?

A2: M3×8mm

Q3:What is the width and height of the rails?

A3: Width: 12mm / Height:8mm

Q4:What are the advantages of upgrading with a linear rail?

A4: Upgrading the POM wheels with linear guide will highly improve print quality and accuracy and the MGN12H linear rail support bowden and direct drive extrusion.

Q5:It doesn't move smoothly,what should I do?

A5:Please spray the block and rail with the Super Lube 3111 and wipe them down with a clean cloth. Then reassemble the block onto the rail. Swipe the block back and forth and it should be a smooth as can be.


Shep
Reviewed in the United States on March 15, 2025
I was pretty excited to receive the linear rail today. However, after opening the package, the sliding action is far from smooth. At certain spots on the rail it feels like it is binding pretty hardcore. I'm sure it will self clearance after repeated use. But, it's supposed to be precision. I'm still going to add some grease and give it a try. If it gets better, I will update my review.
Wayfarer
Reviewed in the United States on February 27, 2025
Typical of second-tier linear rails. Mine needed to be disassembled and cleaned before it would move smoothly. There were no missing balls as is often the case. A teardown, isopropyl alcohol wash, and lubricating with the recommended grease yielded a smoothly running rail. Glad I got it.
Jose
Reviewed in the United States on October 7, 2024
Upgraded by core XY 3D printer to linear rails. All ran super smoothly across the length with no effort. No factory crap to remove and no added oil required. Rails were extremely straight and the added bumpers were a nice addition. Packaging was above standard and the black finishes were a great, classy touch. If you're looking for #12 linear rails, these are the ones.
Mathot
Reviewed in Belgium on October 16, 2024
Rails avec très peu de frottement. Nickel.
Cliff mellangård
Reviewed in Sweden on July 14, 2023
For wath I payed they are very impressive.Works extremely well on my sovol sv05.
Tobias
Reviewed in Sweden on November 6, 2023
Excellent quality, fast delivery.Will order for future projects.
Waldemar c.
Reviewed in the United Kingdom on February 7, 2022
Absolutely perfect, works straight out of the box, didn't have to clean or lubricate it. It's very smooth and solid, no play in a bearing. Definitely will buy another one for my 3d printer.
John Klopp
Reviewed in the United States on August 15, 2021
This rail looks and works great right out of the box. It is super smooth and isn't covered by dirty grease requiring extensive cleaning like many other non-Iwinn rails available.I was planning on changing out the bearings once I got it to high quality bearings, but I don't think I need to. I installed this on one of my ender clone 3d printers on the x axis to replace the v slot gantry and it's so much more reliable now. I'll get more of these to do the y and z axis next. Highly recommended!
James
Reviewed in the United States on March 14, 2021
I ordered two of these just because it was black and one came in regular steel with the rubber end stops and the other came with out rubber end stops but it's black.
Ryan Biddle
Reviewed in the United States on April 12, 2021
The rail and block are smooth and quiet with no free play. I will be buying more for sure.
Misha Guliker
Reviewed in the Netherlands on April 12, 2021
Good quality. Will buy 2 more, to make the whole printer linear.
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