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Hmmm, I left mine stock in Marlin for my 3mm filament. Where did you enter the M405 script? I added the M405 to my start .gcode in Simplify3D. Still nothing.

Here's my "Start .Gcode" script for S3D:

M42 P6 S255 ; lights on
M107 ; start with the fan off
G28 F200 ; home all
M190 S[bed0_temperature] ; set bed temp
M104 T0 S[extruder0_temperature] ; heat left nozzle
M104 T1 S180 ; heat right nozzle for cleaning and leveling
M109 T0 S[extruder0_temperature] ; heat left nozzle
M109 T1 S180 ; heat right nozzle for cleaning and leveling
T0 ; switch to left nozzle and retract filament
G92 E0
G1 E-15 F1200
T1 ; switch to right nozzle and retract filament
G92 E0
G1 E-15 F1200
T0 ; switch back to first nozzle for auto leveling
G1 Z0 F1200 ; raise bed for nozzle cleaning
G1 X12 Y228 F7000 ; position nozzles before brush
G1 Z-2 F1200 ; lower nozzles to brush
G1 X148 Y228 F1000 ; clean nozzles
;G1 X12 Y228 F1500
G1 X148 Y228 F1500
;G1 X12 Y228 F2500
G1 Z0 F1200 ; raise bed to Z0 to avoid contact
G28 X0 Y0 ; home x and y
M204 S300 ; set accel for probing
M203 Z4 ; set z max speed for probing
G29 ; autolevel
M204 S3500 ; set accel back to normal
M203 Z20 ; set z max back to limit
G1 Z5 F200 ; raise nozzle up 5mm
T1 ; switch to right extruder
G92 E0
G1 E15 F600 ; extrude filament back into right nozzle
G92 E0
M104 T1 S0 ; turn right extruder back off
T0 ; switch to left extruder
G92 E0
G1 E15 F600 ; extrude filament back into left nozzle
G1 X16 Y175 F6000 ; move to left extruder prime location
G1 Z0.5 F1200 ; lower Z for prime
G1 X16 Y200 E30 F300 ; prime left extruder
G1 X16 Y205 F9000 ; wipe
G92 E0
M400 ; clear buffer
M405 ; activate filament diameter calibration
;M117 AXIOM Printing... ; Put printing message on LCD screen