Fix Total Height Calculation from PrusaSlicer

[littlejon]

PrusaSlicer adds several commands to the GCODE file that are mistakenly picked up by the Z_HEIGHT_EXPRESSION:

M201 X9000 Y9000 Z500 E10000 ; sets maximum accelerations, mm/sec^2
M203 X500 Y500 Z12 E120 ; sets maximum feedrates, mm/sec
M205 X10.00 Y10.00 Z0.20 E2.50 ; sets the jerk limits, mm/sec

With this, my Total Height calculation is always evaluated to be 500mm.

Please see attached pre & post gcode files.

Gcode files from OctoPrint.zip

[OllisGit]

Hi @littlejon ,

thanks for your pull-request!
You can switch the height methode to "Max Z-Value with Extrusion on Z-Layer" then you will receive 20mm, instead of 500.

But you are right currently every Z line will be identified as a Z movement.

Your PR will be in the next release, currently not planed yet (maybe in two weeks).