fresh install of comunity firmware
bed leveled on four corners at 
.004" (.10mm) 
mesh leveling done with 
same .004" (.10mm)

all measurements done with bed at 50 C. 
for consistancy

sd card removed measurement
 .0015" (.04mm)

rebooted with sd card installed
 nozzle on bed, .001" will not fit

>>> g29 s0
SENDING:G29 S0
Mesh Bed Leveling OFF
5x5 mesh. Z offset: 0.00000
Measured points:
        0        1        2        3        4
 0 +0.02500 +0.00000 -0.00000 -0.00000 +0.02500
 1 +0.02500 +0.05000 +0.07500 +0.07500 +0.10000
 2 +0.07500 +0.10000 +0.15000 +0.15000 +0.17500
 3 +0.05000 +0.05000 +0.10000 +0.12500 +0.12500
 4 -0.02500 -0.02500 +0.02500 +0.00000 +0.00000


M420 s1 sent 

G1 Z0
 measurement .004 (.10mm)