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 sturdy extrusions. I have used them in a few projects. they are strong. the black finish is a nice touch. They are also cut to the right size from the start. 5/5

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 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.

I’ve bought a lot of silver anodized 20 x X (40, 60 and C type) and never encountered quality like this before! Exactly (ok I do not have a vernier or micrometer this large but…) the same length, I bought two 500mm pieces and stood them side by side on my surface plate. With 10x magnification I could not discern any difference in length, nor could I see any machining marks where they had been cut! There were between 2 and 4 tiny burrs evident within the profile on one end of each piece, and they were insignificant and did not extend beyond any contact areas that would negatively impact any build or joint. On both pieces the ENDS were also anodized, I have only ever seen raw aluminum on end faces in the past, and I have bought quite a few lengths from other vendors! T nuts, both drop in and sliding, fitted perfectly and were standard 5mm size, plus the pilot holes in the ends were 4.2mm and perfect for 5mm x 0.8mm tapping. Great quality and added to my favorites for minimal cut builds for CNC and 3D printer projects I have in mind.

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

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.

These aluminum extrusion pieces are accurately cut and beautifully finished. They work very well for custom 3D printers, CNC machines, laser engravers, etc. I highly recommend them!

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 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.

Got this to make my own rotary blade trimmer. I picked the longest available, 600mm 2040. I am 3D printing the blade holder. This extruded bar came in perfect shape, not a single ding on it. It appears to be true as far as squareness goes. I will update with pictures if my project is successful.