These are extra legs the same size and thread as the ones sold by MakeBlock for the xTool D1. As usual, I have included my Fusion 360 files for anyone to play around with.

Creality

Ender 3

No

Doesn't Matter

0.12mm

20%

I used Cura 5.1.0 with tree supports. The supports are not really necessary, but keeps the threads dimensionally accurate. Tree supports increase the print time a lot. If you don't want to use them, just use one of the original metal pieces to correct the threads.