This is a replacement for the stock extruder plate which allows to print with flex filaments. I tried on a medium soft Flex-PLA and it works fine for me.

This is remixed thing. My problem was I printed the original thing with ABS. When I tried to screw the fitting, it just cracked by layers. So I added a thead for the fitting.

The fitting have diameter 6mm. But taking in account that ABS shrinks after cooling, here the version with larger diameter - 7mm. If you will printing with filament without shrinking, use version with 6mm. Also you can print thread tests to figure out which version of thing to use.

Also, here is the link to Tinkerpad model. You can easy to change the model's thread.

Creality

Ender 3

No

Doesn't Matter

0.2

20%, walls - 1.2mm (3 layers, nozzle 0.4)

If you using Cura, try here "ironing" feature. It should give you a nice result.