OUYZGIA 2040 Aluminum Extrusion 350mm 14 inch V Slot 2040 Extrusion for Building 3D Printers CNC Machine (V Slot 2040, 14 inch, 350mm, 2pcs)

These are excellent Aluminum rails. I use them primarily for upgrading my 3D printers and these do the trick. Very accurate, the length and widths are spot on and every thing links together well. The black coating on the outside feels and looks nice too. It’s great there is a good variety of sizes too so you don’t have to worry about cutting to length.

For those not on the metric system, these are 23.5 inches long. They measure exactly 20mm in height and width. These have a smooth anodized finish over the entire surface, including the ends. They are straighter than I have the ability to measure. Should work for lot of purposes, including the CNC setup

Ive ordered so many rails and I think these are the best looking ones Ive received. They are just so well made with such an outstanding finish. As I said, just beautiful. Cant find any flaws. Come packed every well also. Fantastic rails, fair price, would gladly recommend.

This is very standard 2020 V-Slot rail, but it appears to be of good quality, with a good surface finish with no scratches. All 4 pieces were perfectly straight and had no apparent leftover metal shavings anywhere that I could see. Additionally, it even had a nice black finish on both ends, which is often not the case. When measured, it was also dimensionally accurate to within a hundredth of a millimeter -- which is VERY good. I would expect this to work great in either a 3D printer or CNC machine. The only reason I am not giving this 5 stars is because it is a bit pricey for what it is, but the quality is excellent and may be worth it if you are looking for something with a really nice, smooth finish.

I got these as part of the modifications to my tronxy x5sa-400, slowly transitioning toward a VZ-bot 3d printer. The extrusions are cut precisely to 600mm and matched up to the tronxy factory frame exactly. These would be great replacement for damaged rails, or if you are building your own 3d printer frame from scratch.

I have ben getting a lot of these extrusions that come shipped with aluminum bits all over them. These came wrapped well and clean. The finish is excellent and they are straight!

I got these to build a new larger format 3d printer. Ive been using 2020 (vslot) rails for years to build printers. These ones in particular are very good looking because the ends are also anodized, so Im assuming they dont anodize these until after theyre cut, which Ive never seen and appreciate the effort. My only gripe is theres not internal threads in these. Not a big deal for my application, but it may be for somebody else. Otherwise, perfectly straight and nice and sturdy even at 600mm.

These aluminum extrusions were what I needed to extend a small laser cutter. Standard tslots fit with them and the black coating has held up well.

These are exactly as described and well made. This for me is gonna be part of a cnc routers gantry system.

Supposed to be 600mm and these measure 599mm. Also, the packaging is insufficient - you can see one arrived with damage on the end.