****** - Verified Buyer
4.5
The rails come packaged well with a light oil film, not the thick glue/grease like other brands. They don't require any cleaning to move smoothly - Although I did add a light grease.The best thing is that I didn't have to wait 3 weeks for shipping.However, one of the rails was bowed up by about 10mm/m (when sitting on a flat surface). This would probably resolve itself and be fine if you are bolting it to a decently rigid structure. Luckily I ordered extra rails.All 4 of the rails were straight along the sides, except for the bow mentioned above.Used for the v0 mgn9 mod and it got rid of the wobble completely, great railI bought one of these to convert my printer's x-axis and it was relatively smooth out of the box. Took it apart, cleaned everything with isopropyl alcohol and relubed with krytox and it was amazingly smooth. I then decided to buy another one to upgrade another printer and it the quality was dramatically worse. The second one could not move without force. There was a lot of binding and grinding. I was going to give it a clean but upon checking the rail, there was about 1mm deflection in the middle. This probably the reason for the binding. 1mm in the middle of a 350mm rail is really bad. I will be returning the second one.Cheap, yet actually smooth! They say they that chinese rails are always sticky and/or rough, stuffed with thick factory grease. These appear to be an exception. It arrived sealed in a sealed package with a light oil, and came with a ziplock bag with a few extra bearings (which appear to be slightly larger than standard chinese mgn9 bearings, which I take as a sign of quality, but be aware). They run pretty smooth and will slide down the rail by themselves (as opposed to some other cheap rails...). Overall, if you're looking for functional, yet cheap linear guides, these are them.The ball bearings fall out easily if you take the carriage off the rail, but otherwise pretty good quality for the price.I used it to upgrade my laser cutter.The rail fits good and moves very smoothly.It came preoiled.All other 350mm MGN rails from other sellers have 18 holes, but this one had only 17 holes. I had to return since my existing design needs 18 holes.Good basic rail.They need a good degreasing and repacking to make them nice and smooth. There are YouTube videos on how to do this.Ich habe 8 von diesen schienen bestellt und bin Positiv überrascht. Von Solchen china führungen wird ja meist abgeraten. Diese hier kann ich nur empfehlen.Alles 8 Stück waren gleich. Die wagen laufen nach reinigung der schiene super weich und ohne hacken oder hängen bleiben. Die Schiene an sich war gerade und nicht krumm wie manch andere. Ich habe diese schienen seit über 2000 STD in meinem 3D drucker und drucke immer noch ohne Probleme. Voraussetzung natürlich eine gut schmierung!
