MGN12H 300mm Linear Slide Rail MGN12 for 3D Printer Rails and CNC Machine Rails

Buying inexpensive linear rails is a total hit or miss. Hiwin is the way to go, but man they're pricy. I really wanted black rails as well, so I figured I'd give these a shot. Ordered two - packaging was meh, they were of course covered in oil to prevent corrosion, but overall the rails moved pretty well. Both rails arrived straight and true, and there's no play in the carriage which is nice too. Properly cleaning and lubricating these made a world of difference, as expected, and so far they've been on my Ender 3 v2 with great success. One had some very minor rough spots that have seem to smooth out without introducing any play, which is always worrying but nonetheless. These aren't the Hiwin rails by any means, but I'm quite delighted with the quality for the price point and plan to buy more in the future. Will definitely update this after I've had some more time with them, but I've had them in use for about 3 weeks now and they've been treating me well.

very good, thanks

Make sure to measure your part carefully! The spacing between the main mounting holes is 25mm but the spacing from the end of the rail to the first mounting hole is 12mm, NOT 10mm (DIMENSION E). For the 200mm rail, there are 8 mounting holes total. I modeled this in my design with just the drawing dimensions and had to remake my part due to the bad dimensions. Measure twice, cut once!

These work great! I used them to upgrade my Ender 5 plus!

I installed these into my 3D printer for the X-axis. they look good, feel smooth and were otherwise very solid feeling. they've worked perfectly so far.

Purchased for a z conversion on a ender 3. Out of the box the carriage slides great, just cleaned up the rails a little and good to go.

Bought this set and a single rail from another company, this set was perfectly flat and straight, the single rail from another place for the same price as one of these rails, and it was bent like a rainbow! with +1mm bend from one side to the other. These rails are definitely the best bang for your buck!

They slid terribly apon arrival. After degreasing, adjusting the bearing retainer bar (was too tight) and re-greasing they slid okay-ish. Still quite a bit of hitching but it no longer requires significant force to unstick.

Wenn man Bastkler ist und sich mit CNC und 3D-Druckern auseinandersetzt, kommt man um Linearschienen nicht herum. Komisch ist aber, daß jeder Lieferant ein anderes Maß versendet, obwohl bei allen die gleichen Maße angegeben sind. Man kann nicht Schlitten oder Schine tauschen, dann ist es entweder zu locker oder zu fest, daß man die Kugeln einzeln spürt. Hier aber schön gleichmäßig hergestellt und geschliffen, nichts wackelt, komplett spielfrei und sauber. Kommt an meinen 3D-Drucker, den ich statt der sich schnell abreibenden Rollen dann mit Linearführungen fahre in allen Axen. Kein Verschleiß, kein Räderstaub, kein ewiges wieder-einstellen-müssen von Riemenspannung und Andruckkraft der Rollen am Profil.

After reading some reviews I was a little skeptical but I ordered anyway because I needed rails for my ender 3 y axis. I can say these have no play in them and they are nice and smooth. They came with anti-corrosion grease. Packaging wasn't great. They came wrapped in their own plastic sleeve individually but one of them had a hole in one side so when I picked it up it was enough for the rail to fall out, but not the carriage. When I tried to put it back together the bearings went EVERYWHERE so I was looking for approximately 15-20 tiny bearings that were hard to see on the carpet. Luckily it's really short, flat carpet and not shag. Also lucky I got some magnets from amazon that came in a couple days before these that made it a lot easier to find and grab them with. After I found them all again I was a little more careful putting it back together. They are a little rough at first but some good lube and you're good to go. 5 stars for the rails, 3 stars for the packaging

I didn't like the fact I had to buy replacement bearings as they didn't come all perfectly i had some balls smaller than others so I brought a pack of g25 steel ball bearings and now the blocks run smooth like butter. I like they come with that black finish so they don't corrode or rust over time and I feel like the black finish dampens the noise of the bearings rolling compared to my steel linear rail i got of AliExpress they are pretty good rails these black ones are I'd buy them again.

Super verarbeitet und laufen perfekt und ruhig. Kann ich absolut empfehlen.

Ich habe die IMETRX Linearführung MGN12H 400mm für mein Voron 350 erworben, um ein Upgrade von MGN 9 auf MGN 12 durchzuführen, und ich könnte nicht zufriedener sein! Die Installation war unkompliziert, und die Verbesserung in der Stabilität und Lage meiner Achse ist sofort spürbar. Die MGN12H Schiene bietet eine deutlich höhere Steifigkeit und Präzision, was sich positiv auf die Druckqualität auswirkt. Ich habe seit dem Upgrade eine merkliche Reduzierung von Vibrationen und ein insgesamt ruhigeres Druckverhalten festgestellt. Die Verarbeitung der Linearführung ist erstklassig, und ich schätze die robuste Bauweise, die für eine lange Lebensdauer sorgt. Wenn Sie auf der Suche nach einer Möglichkeit sind, die Leistung Ihres 3D-Druckers zu verbessern, kann ich die IMETRX MGN12H Linearführung nur wärmstens empfehlen.