4pcs 400mm T Slot 2020 Aluminum Extrusion European Standard Anodized Linear Rail for 3D Printer Parts and CNC DIY Black(15.75inch)

I ordered two 4-packs of the 600mm (23.6") silver extrusions to frame out a custom, heavy-duty sliding under-desk keyboard tray.Build Quality & Finish• Straightness: All rails arrived perfectly straight with zero bowing or twist, which was critical for ensuring smooth, bind-free linear slide movement.• Surface & Cut Ends: The silver anodizing is clean, consistent, and scratch-resistant. The factory cut ends are square and clean with minimal burring, meaning very little prep was needed before bolting things together.• Slot Fit: Standard European-spec 20-series hardware (drop-in T-nuts, roll-in spring nuts, and standard M4/M5 hardware) slid into the slots without binding or excessive play.Shipping ExperienceThere was an initial fulfillment mishap where two boxes arrived, but one box was completely empty. However, Amazon customer service resolved the issue right away and sent out a replacement set without hassle.Once the replacement arrived, the build came together quickly. The 2020 profile provides plenty of rigidity to eliminate bounce and sag under hand pressure while keeping the keyboard tray assembly lightweight and low-profile. A solid choice for 3D printer parts, desk attachments, or general maker builds.

Great quality product and the sizing was exact. It can be used in many different way.

Good quality, great price! Useful for my home projects.

I bought 6 sets of these in different lengths and am highly impressed. Sturdy, precisely formed, cleanly cut, individually wrapped in protective plastic, then boxed. They all arrived in excellent condition, no dings, dents or bends. There were a few minor burrs on the ends from the cutoff saw, but they were so minor 1 or 2 strokes of a fine file removed them. Honestly, if I didn't have a file I could have left them as is--VERY nice!

Careful to read the dimension page. These ARE NOT typical 20-Series, these are NON-STD 10-series (slightly smaller) which are 20mm x 20mm. Production is working well but make sure you order the appropriate 20mm t-nut kit or components.I can make this work for what I need. I need to research the material strength over distance calculations. For small motion control, safer & vision equipment evals this should be ok…from an EE perspective. Demo and test stand should be good enough once complete and all components properly cut and mounted.

Good quality well made easy to work with.

I bought these to make a top-hat for my Voron Trident. There's nothing wrong with the extrusions. Be careful though: The outer dimensions are the same as what you would see from an LDO kit, but the center hole cannot be tapped for M5. You'll have to tap the center for M6. Make sure you have the hardware on hand. Also, these are anodized aluminum with a perfectly reasonable finish, but if you compare it to the finish of your LDO kit you will be disappointed.

They worked for my purposes. Easy to cut with a small ryobi bandsaw. Used these to make a stand for my case and bullet feeder. I will buy again.

These aluminum extrusions are accurate to the stated dimensions, and well machined. I used them to add linear rails to a 3D printer, and found them to be straight and free of any warping or manufacturing issues.

Très bien usinés et à bon prix.Installé pour réaliser une pergola en extérieur.

These 2020 rails were perfect for building my resin printer isolation box.The product was in perfect condition when it arrived on time.

Used these to frame up solar panel mounts for my sailboat. They are great, and survived over 40 knot storms on the ocean and haven't rusted or anything.

Works great for what I wanted