This is bigger impeller for BL-2512S pump pressure and flow will increase significantly and power will increase from original 60W to 160W (4,7A and 12,7A at 12,5V). Use it at your own risk since there is no motor cooling. Because during 3d printing you get smaller inner diameter there are 5 versions, "Impeller.stl" was tight fit for me straight out of printer.

Max pump head is 3,8m but flow is really low at this height, flow at 2m head is good.

There are 5 models and only difference is shaft diameter.
impeller-02 stands for 4,95mm shaft
impeller-01 stands for 5,15mm shaft
impeller stands for 5,35mm shaft
impeller+01 stands for 5,55mm shaft
impeller+02 stands for 5,75mm shaft

Flsun kossel big pulley

Doesn't Matter

Yes

0,2

15-30%

Supports touching buildplate needed!!