Running CuraEngine from CMD Line / Powershell

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Hi, I'm looking into 3D printing optimization, and I'd like to run Cura's slicer in an iterative loop to generate gcode and a print-time estimate. Hence I'm not bothering with the GUI.

 

I'm using Python, have 15.04 and Lulzbot's 2.6 versions of Cura, and I'm still learning (started programming in Python a month ago).

 

So far, I understand the basic principle of Cura's commands, and have messed around with them in PowerShell before using Python's os.system command. Right now, I just want to specify an input and an output filepath, like so:

 

CuraEngine slice -p -j "C:\..." -o "C:\..." -l "C:..." 

 

But I'm given an error:

[ERROR] Trying to retrieve unregistered setting with no value given: 'mesh_rotation_matrix'

 

This comes up with or without specifying a json profile (I'm just using -p, -j, -o, and -l arguments), so I don't see how a missing setting could throw an error. I mean, it should be using the default/generic fdmprinter.json right? This is also using lulzbot's CuraEngine (haven't added Ultimaker's to the path to avoid confusion).

 

Could anyone tell me what I'm doing wrong?

 

Also, if anyone could point me in the direction of a json profile for a MakerGear M2, that would be awesome.