Ender autolevel

Ender Series Creality Ender-3 V2
1

so my printer is working fine.
but when it does the first line on the left, if you look at the front of the printer.
it is 2 low.

but my plate is straight.
i also did the autolevel, and the z-offset.

what i do not understand i have a cr bltouch level,
i assume the bltouch there to see how high my bed is.

i assume if it sees, okey there the bed is higher, the it will change the z ax by itself.

i still do not see the usage of the bltouch yet??

in this case do i have the set my bed not straigt?

the bltouch i only see checking ones before printing.

2

I am new 3D-er so accept my explanation with that provision.
Even though you have touch levelling, it is still necessary to do the initial levelling with the sheet of paper and turning the levelling wheels.
The touch levelling is used after levelling with the paper and then what it does is touch the different positions on the plate and remembers any differences and adjusts the print program to accommodate the differences. It does not make any physical changes to the bed level.
Someone with more experience may have a better explanation.

3

does this mean when it does the auto level set on each corner.
i also have to use the paper ?

what i did was manual level the bed also the wheels, etc.
with the paper on the whole plate. en bed heated
set the z off set, with the z-as on zero , after auto home.
when it was finished i did the autolevel, and did nothing till that ends.

then i reset the z offset if needed and that was it.

4

No, let the auto level work without paper.
Level the bed first with paper, second, set the z-axis and then third start the auto level and let it do its work.

5

okey thanks,

then in my code i had to add m29 for the auto level.

but why is it only checking the middle of the bed, is that enough?
Before each print?