10PCS 48inch(1220mm) T Slot 2020 Aluminum Extrusion Profile for 3D Printer and CNC DIY, High-Strength European Standard Extruded Aluminum Linear Rail Guide, Anodizing Technology(Silver)

Got 40 4ft pieces via 3 separate orders at different times for projects. I consider this to be enough to judge company quality. I work as a Quality Manager at a large precision manufacturing company and order different types of extrusion at least twice a month for various reasons. Keeping this in mind, the following is my thoughts on this 2020 extrusion.FIRST THOUGHTS: Great finish(black), diameter, slot size and depth is within .002" which happens to be the margin of error for the calipers I was using. This is exceedingly good, but expected due to how extrusion is manufactured.LENGTH ACCURACY: Simply stated, it's seems to have been purposely cut long enough to accommodate kerf loss on one or two cuts. Can't say if it's different for the other length options. On average, they measured an 1/8"(.125) long or so. I appreciated this immensely.CUTTING: Use an 80-100 tooth thin kerf blade that specifically states aluminum(miter saw, table saw,ect). Very accurate, clean cuts on the miter saw setup I used.CONDITION: Each piece was individually wrapped and visually straight(good for my purposes). Beautifully packaged, seriously. I order mitsumi extrusion at work that at times comes in scratched up and slightly bent at 4-6x the price and lead time. Perfect finish. Great packaging.TIP FOR REMOVING PLASTIC WRAP:DO NOT TRY TO PEEL IT OFF! It will just shred and turn a 15 second job into a 5-10 min job per piece. Using a knife with a dull tip and sharp edge, flip the knife upside down and place the blade edge facing up inside the extrusion slot, run it quickly down the inside of the extrusion slot at a low angle using your fingers to control depth.This makes short work of the plastic wrap by slicing it off cleanly instead of ripping off small chunks. 40 pc in 5 Mins.I was not solicited in any way for this review.Seriously 10/10.

I was weary of some of the extruded aluminum from past purchases but this product exceeded my expectations. Each aluminum extrusion was fully wrapped (I took my knife and flipped it facing up & cut along the groove to slice through the wrap) and very straight. Each length was perfectly cut to length even though I was planning to trim most of the pieces.The anodized surface is excellent. It's not painted like I've seen with others. The black finish seems to be smoother than my silver finish I have. I'm rebuilding my laser diode as the new module is to heavy for the 2020 extrusion to handle so this 2040 was the next upgrade.I cut using my 14" metal saw but I know these can be cut with a miter saw but do clamp this down if you do use a miter saw.Very straight, quality, and will be buying more in the future!

I'm using them as part of a large DIY CNC project. Every bar is near perfectly straight, I've measured them at 1 thousandths off from straight which is amazing. Very sturdy and well manufactured. I will definitely get these again if they are needed, but I ordered a large case of 10x48 inches so I may be set for a while. I only needed 4x 24 inch pieces so I cut them on my band saw. They seem very rigid. There's no scratches or nicks on them and the ends are clean.

I like it shipping’s on time ,good qualityWorth the money , I bought it to build cutting machine for hobbies ,

This is exactly what you think it is however I have noticed a few of the screws get loose and back themselves out. I suggest using a little lock tight if you don’t plan on taking it apart

Cutting and assembly can be tricky. Patience and a plan is a must. Get some graphite lubricant spray for any sliding parts you may need to adjust. I've gone through 1 box and got a second to keep some stock of it.

Accurate 20mm dimensions. 5mm center hole ready for 6mm bolt tap. No issues.

The product was as expected, not much to review.