Adding BL Touch to Ender 6 CoreXY ?
You need only 2 parts and install firmware.
https://www.youtube.com/watch?v=jWjK9ECebMA&t
Probe: Genuine ANTCLABS BLTouch v3.1 Auto Bed Leveling Sensor – 3D Printing Canada
Cable: https://3dprintingcanada.com/products/bltouch-extension-cables-ecbiqu12