300mm 8mm T8 Lead Screw Set Lead Screw+ Copper Nut + Coupler+Hexagon Wrench + Pillow Bearing Block for 3D Printer

I found this to be a complete, nicely machined collection of parts that fully met my needs, and I gave it five stars. However, be aware that: (1) The rod, itself, is 300mm, but the working range is at best 260mm, after the pillow blocks and coupling are installed (as skinny as possible). Obvious, but not stated anywhere in the description. (2) The brass traveler nut is not a zero-backlash device. Hard to measure it, but clearly visible playing with a loose nut on the rod. One trick: don't mount the nut with perfect axial alignment. Tilt it a bit with shim stock until you get the right combination of backlash and friction for your application. Expect wear. (3) The provided Allen wrench for the pillow block setscrews was too small to work properly--it simply cammed in the hole. I measured it as 1.46mm (flat to flat), but the setscrews appear to be 1/16". My 1/16" Allen wrench (measured at 1.57mm) fit perfectly and got the job done.

The lead screw are straight, properly threaded, right thread pitch and of a nice quality. The nut glides smoothly down the threads without needing to oil or clean it first. I used this as my Z axis on a cnc, have a good result. And they’re a good fit at a decent price. I am very happy with the quality and price.

Product is high quality and straight, though it doesn't fit on an ender 3. It's too short

Great item I found this item from another blog website on how to make an conveyor belt. The kit came with everything in the listing. Over all a great item if you need this kit or parts to fix a 3d printer.

While likely fine for the construction of FFF printers, these have too much play to be acceptable for constructing precision laser cutters.

If your studying Robotic & Mechatronic's are Just a tinker this is well worth the money ! Great for Building Screw jack or Mini rail driven actuator . there are some many ways to use it !

This is a nice little quick kit for the price it's not super heavy duty but I did not expect it to be either good buy

I ordered two of these and one was 293mm long and the other was 291mm long. One package was also missing the coupler and nut. Screw on one also had several burs.