BIQU 400mm 8mm T8 Lead Screw Set Lead Screw+ Copper Nut + Coupler + Pillow Bearing Block for 3D Printer

Very nice quality, I would buy again. Not used for the usual purpose but the bearings seem quite true and the screw is smooth and fits snugly into the bearings

The items shipped in a tube in a box. Everything arrived as it should and the parts do not show a lot of slop. Gravity alone will allow the nut to spin down the lead screw. Very little slop/backlash between the nut and the screw.The set screws used in the coupler are the right length for the 8mm side, but have to protrude very deeply into the coupler to bite into the 5mm shaft. Longer set screws fixed that easily enough. I also think the set screws should not be at 90 degrees from each other, but at 180 to bite into the two flats on the shaft of the 28BYJ-48 motors.

Good product.

The follower Nut needed to be worked a little to remove some small machine burrs, but the bearings, and coupler fit and work well together. The Threaded Lead Screws are straight, properly threaded, right thread pitch, and of a nice quality. They work nicely on the 2D printer that I am building.

This is plenty good for the price. Tiny little bit of backlash as expected but I got this for a Z ais so it shouldn't be a problem. Flexible coupling is very flexible but works fine I would prefer it to be stiffer or to have a rigid coupler..

Ender 3 lead screw, this screw is the perfect for for a ender 3. The nut doesn't fit but the screw fits the preexisting one. Was shipped in a tube to prevent bending and it was perfectly straight.

The media could not be loaded. Screw and rod ok, bearings crooked

I ordered this to use as part of a 3D- printer project. This item is made exceptionally well, and I would recommend it to anyone seeking to build a 3D-printer, or a CNC machine.Well made, just be sure to not over-tighten the screws that hold the coupler to the shaft. They can strip fairly easily.