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

I grab these extrusions whenever I see a good deal. I use them for projects, repairs, anywhere I need infinite adjustability and versatility. The black anodizing is attractive and tough. Love these.

No issues. Good quality and finish. Product arrived extremely well wrapped on time. Five stars from me.

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.

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!

These are perfect! They are just what I expected. They came neatly wrapped and have a very clean finish. Even the ends have a matching finish. There are no shiny cut ends.⭐️⭐️⭐️⭐️⭐️

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

I got these to convert one of my older 3D printers into a printer with a larger build area. They are straight, and the measurements are dead on within an acceptable amount. I took my hotend off the cross rail from the printer I am modifying and it slid right onto the rails and back and forth motion was very smooth. All the sides and ends are finished. There are no burrs, scratches, or any imperfections that I could see. Another reviewer thought they were a bit pricey, but 4 packs go for about 30-36 dollars so while on the higher end of the spectrum still within the normal price range.

Its difficult to review these - its exactly what I expected and as advertised. Each piece was individually wrapped, theyre straight and true. No damage or defects. Im using these to extend the Z axis on a 3D printer and theyre just what I needed.

The width lets me add stability to my vertical test bed, for motherboards.

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.