@droftarts
Maybe I am wrong , but the Marlin skew correction values are opposite than those for RRF. What I mean, as per old method of measuring the skew, if the angle was acute the values were negative ; if the angle is obtuse, the values were positive. As I see in the calculator, the acute angle has positive values and obtuse angle has negative values. With "angle" I mean the angle between AD and AB sides. Am I wrong?

@fcwilt That's what I was thinking. A magnetic sensor can do the trick I believe.

@phaedrux Yes. Looks like that is the easy solution. Thanks.

I want to use Duet not for a 3d printer. My project is to autoalign and measure a device ( e.g. a screen) to automatically apply touchscreen or protection covers. Because the devices have different sizes I want to automatically calculate the dimensions

Hi. I would like to ask if is there any possibility to use MIN and MAX endstop switches to define the bed size. What I mean is that I want the firmware to calculate the travel between MIN and MAX endstops and save the bed size accordingly. Thanks.