So it’s supposed to be a double paper in the back and a single up front? Could somebody explain this is?
The same at 5 different locations. All 4 corners and middle. Usually about 0,2mm wish is about what a folded papper is. But you can use a microblade that is 0,2-0,3 or use a feelgauge. There is other solutions but some of them is a lite overkill. As long as you have the bed flat and about 0,2mm to the nozzle your good enouph. However it might be that your bed is not flat and there is many reasons that can cause this. The most common is the way the glassplate is held in place pressuring the 4 corners down making the middle lift. But there is a couple more reasons.
// Marlark
Yes, on the back there is ok clearence, a sheet of paper. When I move the head more and more to the front Y it catches the buildplate, even with the front screw bottomed out…problems…
Raise the bed and screw the z axis endstop screw so you dont have the bed at the bottom. That way you have play on those three leveling screws under the bed.
Yep, it also helps to really tighten the 4 screws for the bed plate…