Okay, thanks for letting me know, here is the copied text of my initial post:
Hey @dskerr , if you have followed the last post of your other topic
and you want to adjust or calibrate your machine anyways you could send the snapmaker marlin commands over the terminal. maybe look at this, https://marlinfw.org/docs/gcode
COMMAND: M503 shows you actual calibration settings:
Send: N78 M503*26
Recv: echo:Steps per unit:
Recv: echo: M92 X400.00 Y400.00 Z400.00 E92.60
Recv: echo:Maximum feedrates (mm/s):
Recv: echo: M203 X300.00 Y300.00 Z5.00 E25.00
Recv: echo:Maximum Acceleration (mm/s2):
Recv: echo: M201 X1000 Y1000 Z100 E10000 X_CNC100 Y_CNC100 Z_CNC100 E_CNC100 X_LASER3600 Y_LASER3600 Z_LASER3600
Recv: echo:Accelerations: P=printing, R=retract and T=travel
Recv: echo: M204 P1000.00 R1000.00 T1000.00
Recv: echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s), Z=maximum Z jerk (mm/s), E=maximum E jerk (mm/s)
Recv: echo: M205 S0.00 T0.00 B20000 X20.00 Z0.40 E5.00
Recv: echo:Home offset (mm):
Recv: echo: M206 X-4.50 Y-5.50 Z-5.40
Recv: Mesh bed leveling:
Recv: echo: M420 S1 X2 Y2
Recv: echo: M421 X5.00 Y5.00 Z0.25 //this lines are the Z offsets per position
Recv: echo: M421 X120.00 Y5.00 Z-0.50 // there are four positions on the bed where it is calibrated
Recv: echo: M421 X5.00 Y120.00 Z0.00 // these are my current offsets
Recv: echo: M421 X120.00 Y120.00 Z-0.55
Recv: echo:Z2 Endstop adjustment (mm):
Recv: echo: M666 Z0.00
Recv: echo:PID settings:
Recv: echo: M301 P22.20 I30.00 D18.00 C100.00 L20
Recv: echo:Filament settings: Disabled
Recv: echo: M200 D3.00
Recv: echo: M200 D0
Recv: ok
If you want to calibrate your bed:
G28 : home axis
M420 S1 : set mesh adjustment (calibrate bed height) active
G29 S0 : shows you the actual bed mesh
i have figured out, it is complicated 
my printer doesn´t go to the right points of messurement.
my way works like this:
ATTENTION give the Z some height at every positon NOT to collidate with the bed!
i give you no warranty or something else, if you destroy something, i am guilt-free
go to your position, i.e. X5 Y5 Z1
now, turn your Z down till the paper works for you (like normal calibration) like
Z0.9
Z0.8
etc.
X5 Y5 Z0.5 : calibrate this position to Z0.5:
G29 S3 X1 Y1 Z0.5
X120 Y5 Z0.6 : calibrate this position to Z0.6:
G29 S3 X2 Y1 Z0.6
X5 Y120 Z0.7 : calibrate this position to Z0.7:
G29 S3 X1 Y2 Z0.7
X120 Y120 Z0.8 : calibrate this position to Z0.8:
G29 S3 X2 Y2 Z0.8
here are the points of interest:
Recv: Mesh bed leveling:
Recv: echo: M420 S1 X2 Y2
Recv: echo: 1: M421 X5.00 Y5.00 Z0.25
Recv: echo: 2: M421 X120.00 Y5.00 Z-0.50
Recv: echo: 4: M421 X5.00 Y120.00 Z0.00
Recv: echo: 3: M421 X120.00 Y120.00 Z-0.55
Recv: Measured points:
Recv: 1:0.25000 2:-0.50000
Recv: 4:0.00000 3:-0.55000
Recv: ok
X5.00 Y5.00 : 1 (0.25) : left forward : X1 Y1
X120.00 Y5.00 : 2 (-0.5) : right forward : X2 Y1
X120.00 Y120.00: 3 (-0.55): right backward: X2 Y2
X5.00 Y120.00 : 4 (0.00) : left backward : X1 Y2
now you have to save your settings:
M500 : save to eeprom
check your calibration settings:
M503 or G29 S0
FINISH
feel free to contact me,
greets Chris