West3D Printing MGN12H-1R-300/350/400/450 Linear Rails with Carriages CNA

CNA / West3DSKU: W30004307

Length: 300mm
Color: Silver
Sale price$21.99

Customer Reviews

Based on 3 reviews
Decent rail

This rail is working fairly well for me on my custom-machined voron x-axis. I was able to request an ungreased rail which saved me from having to clean off any factory-applied grease. Unfortunately it is not the smoothest rail I've used. It is noticeably notchy when sliding in one direction but not the other, taking a surprising amount of force to clear the notches/detents. I'm not seeing any artifacts in my prints caused by it, but it does not feel great when sliding by hand.

Good rail, bad grease

Great quality rail with a decently high preload. The grease did get thick in the mail, so it was a huge pain to get off.

Very nice rails, not great greasing.

The rails are very nice, but the grease job is basically useless and more of an annoyance than anything. The grease job was basically just grease applied to the block through the back via a mounting hole. There was enough grease for sure, but it didn't get where it was supposed to at all. Expect to have to clean up a bunch of grease and apply your own.

Hi Jason, thank you for sharing your feedback on the rails and grease- this is the “LDO” method and is intended to inject grease directly into the carriage through the mounting hole to reach the bearings. We agree it is wasteful, and I recommend cleaning out the mounting hole which is filled with grease.

If we receive more feedback like this we may go back to shipping these dry. I appreciate the review! Thank you.


These rails are a result of a collaboration effort with CNA (BOM Sourcing Guide Recommended) and West3D. We went to them and asked them to think of our use case and design their rails specifically for high speed (and high vibration) 3D Printing. This resulted in us selecting a heavier than standard pre-load (a slight reduction in clearance between the rail and the carriage).

We then moved to improve the design aesthetic over what CNA typically ships. This gave us black carriage end caps and added our West3D logo on the carriage in a way that is tasteful and helps break up the traditional matte silver in the carriage block. We also made sure they provided us carriages with grease ports for your added convenience.

Lastly, we said why shouldn't these be stainless steel, I mean that's kind of our thing.

The result are these rails. We went through and tested 10 rails before listing these, all of our tests provided for a stiff (re: pre-load) but wonderfully smooth glide - especially compared to the standard 'kit' grade rails we tested.  

Note - for a Voron Trident (and other)  users you require rails 50mm larger than you bed size, you will need multiple of these rails (please check your BOM if you're making build to confirm how many mms you need and the correct quantities).

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