2PCS 400mm（15.75 Inches）Tr8x8 Lead Screw with T8 Brass Nut (Acme Thread, 2mm Pitch, 4 Starts, 8mm Lead) for LCD DLP SLA 3D Printer Z Axis and CNC Machine

Seem to work good for my printer mod.

worked just fine

correcto y util...

I wanted to upgrade my 3018 Pro CNC laser to a 600mm bed. This lead screw worked perfectly. Item is straight and the threads are clean. I will add this if you are considering replacing a lead screw. Pay attention to the thread pitch and number of starts. I originally purchased one with a different number of starts. No fault of the seller or the item, purely an oversight on my behalf.

The lead screw on my ender 3 pro came bent. I got the 400mm Tr8x8 as a replacement and it fits perfectly. Smooth like butter and perfectly straight. I didn't have any issues with leveling the motor or the screw, it sat perfectly straight on the first try. I even like that it's a little taller than my old one. I don't use a top mounted spool, but it might get in the way if you did.

I have a Dual Z setup, and wanted to do a Creality OEM Z-height increase. It worked perfectly.

My Ender 3 Pro came with a single T8-8mm lead screw. These are T8 2mm lead screws, which means that you will have more steps to move 1mm up or down and there should be less backlash as well as better torque which translates to the ability to have additional mass on the X axis without detriment to velocity (should not be a LOT o velocity in Z moves anyway).The standard lead screws for an Ender 3 is 365mm, these are a little longer which will allow longer verticals to be installed. My direct drive Ender 3 Pro now has a Z max height of nearly 300mm despite the stepper motor being in the way.ETA: Swapped the DD for a Orbiter v1.5 and it no longer gets in the way of the crossbeam at the top of my Z axis, now my build height is 320mm!***** Also, for Klipper users, this has a rotational distance of 2, not 8 like a 4-start screw *****

I purchased these to increase the Z Height on my Ender 3 Pro. When I received them, they were both slightly bent. The bend was enough to cause binding on the upward travel of my Ender 3 Pro gantry. I laid them flat and rolled them until I could see a gap. One gap measured 1.7mm and the other measured 2mm. Making both lead screws unusable. Poor Quality control, soft metal that allows them to easily bend. The lead screw nuts were fine and if perfect condition. Sadly, I had them sitting on a shelf, and was not able to return them since they were outside the return window.I do NOT recommend purchasing this because the Quality Control is just not up to par on such a vital part of a 3D printer.

Both leadscrews arrived nice and straight and are on par with others I have purchased.Brass nut has same acceptable tolerance/backlash as you would find on other leadscrews and functions with no issues.

Las varillas son de exclente calidad, ya las probe y practimante el desplazamiento es muy suave, por ello eston contento con el funcionamientod e mi impresora custom.

The media could not be loaded. It's crap. The ordinary ones from Canadian Tire are better than these.

I used these on my DIY project. Worked as expected. The nuts moves smoothly even without lubrication.

I'm pretty sure this is the same with every brand but not sure, it was really easy to bend. It came straight but after applying a bit of pressure while installing it, it got bent, not severely but you could tell when rolling it that it was bent. 4 stars because most are probably like this so be careful when handling.