Dual extruder X Y calibration sample

My version of X Y calibration in 1 print.

This is intended for fine tuning, so you'll have to get within + - 0.2 mm offset.
One method I used is a phone with a camera.
Put the phone with the screen and the forward facing camera up on the print bed and let the nozzle hover above the camera for few tenths of mm.
On the phone screen you can now see a nice large nozzle which you can nicely center on the screen. (Play a little bit with the lighting to get a nice bright picture)

Give a gcod