BG534933123 This does indeed fit on the Ender 3 Pro V1.5, but you'll have to do some tweaks. 1. If your Z-axis stepper motor has a press-mounted brass-looking gear on it, you'll have to remove it. These can sit real tight and I strongly advice against trying to get it off with pliers. I got mine off by borrowing a small hydraulic press - super easy and didn't damage anything. 2. The arm that compresses the spring will collide with the Z-axis guide screw(the big one) making the spring a bit tricky to install. What I did was put the small screw inside the orange spring and then pushed it into position - you can then screw it into place using an allen key. 3. The first PTFE tube holder thingy will not fit, it will collide with the Z-axis guide screw. But it works just fine without it. Whether this product actually has an impact on your print quality I can't tell. Also remember to re-calibrate your E-steps.