Odd Z-position display in Web Interface

[darookee]

I just noticed something odd in the Web Interface. When printing the first layer at 0.18mm it displays Z as 0.00. First I thought it was because of the new version so I reverted to 1.16 but it still is off. In the screenshot here http://imgur.com/oPWwMjl you can see the difference between the message generated from the slicer and the Z display from the Web Interface. The message is generated with this:

M117 printing layer [layer_num] at [layer_z]mm
 

I'm using dc42's Z-Probe with these Settings

G31 T1 P500 X40.0 Y-13.0 Z2.35
 

And my bed.g looks like this, after reverting to 1.16:

M561						; clear any bed transform, otherwise homing may be at the wrong height
 
; Probe 8 points, use as much as you can take
G30 P0 X40 Y25 Z-9999 H0
G30 P1 X40 Y200 Z-9999 H0
G30 P2 X145 Y200 Z-9999 H0
G30 P3 X145 Y25 Z-9999 H0
G30 P4 X100 Y100 Z-9999 S4
 

On 1.17rc1 I used G29 with this grid:

M557 X20:180 Y20:180 S20

Changing the trigger height of the probe does nothing to this behavior and the print seems to be unaffected…

[dc42]

What Z height does the gcode file command the print to start at?

[darookee]

0.216 - This are the few first lines of the file:

M106 S153
M140 S65 ; set bed temperature
M104 S220         ; set extruder temperature
M98 P/sys/before_print.g
G21 ; set units to millimeters
G90 ; use absolute coordinates
M83 ; use relative distances for extrusion
M106 S153
G1 Z0.216 F7200.000
M117 printing layer 0 at 0.216mm
G10 ; retract
G1 Z0.416 F7200.000
G1 X51.287 Y59.454 F7200.000
G1 Z0.216 F7200.000
G11 ; unretract
 

I'm normally using the prusa version of slic3r but used simplify 3d for another print today and noticed, that it did display the Z-position correctly:

G90
M83
T0			; Use Tool 0
M106 S153		; Set fan speed
M140 S65	; set bed temperature
M104 S220         	; set extruder temperature
M98 P/sys/before_print.g
G1 E-2.5000 F2400
G1 Z0.244 F600
; layer 1, Z = 0.144
T0
; tool H0.160 W0.480
; skirt
G1 X99.329 Y91.984 F7200
G1 Z0.144 F600
 

[darookee]

I justed started another print with the file from slic3r and it is moving too low for the first layer…

[darookee]

I tried reslicing the model from the slic3r file with S3D and now the Web Interface correctly display 0.18 for the first layer. And it seems that it is also correct, the nozzle does not scape on the bed… So it seems it is a problem with slic3r?