Geeetech

I tried to compile a newer firmware but I keep getting errors.
I will try other IDE versions with older Marlin and see if anything will compile.

Plus, why does my SD card not read anything?
Is there a special format it needs?

I have no idea what is happening here. I have the machine all calibrated. Every direction moves very accurately. It doesn't matter what I do with any Z-value (in a program, in an offset, home offset, probe offset...) the machine will not get any closer than 6.3mm from the table! This is the display ...

Another potential area of misalignment is the homing adjustment screw for each arm. Bring the machine X0, Y0, Z30 (whatever gauge block you use) Then bring it close to one of the posts. See if it goes up or down from the gauge block height. Keep track. Test all three spots as close to each post as p...

This sounds more like your step/mm count is off. Type M503 and see what those numbers are for the M92 line. Use a business card (very close to 50mm) and lay it flat. Press the X or Y in 50 increment and see how far out it gets in each step. If it is always short then you need to increase the M92 val...