X-carve Z-Probe not accurate

how do you calibrate z-probe

I don’t use Easel, but it tells you how to get to the advance settings to change the thickness.

Thanks a lot Martin !
May I ask what you use if you don’ t use Easel ? ( just for me to may be investigate on other tools )
thanks again,

I use the stable version of the Classic 2015 Universal Gcode Sender on a 10 year old laptop. I draw in Rhino3d. I use Meshcam for 3d drawings and CamBam for 2D drawings.