-=This is now part of the Cura post-processing script and will be maintained within Github=-

This is a Cura postprocessing script that is very similar to Geeetech's color mixing software for 2 to 1 dual extruders like the A10M or A20M. This script uses the M163 and M164 commands to create different extruder mixing ratios at defined layers or heights saving to T2. There is also the ability to blend from one mix to another over a distance.

The layer units are easy to use in Cura as you can preview the layers and quickly setup your profile.
The mm units assumes all of the layers are the same thickness, even the first layer.

You can overwrite previous mixes and make interesting designs.
ex. blends within each other

If you are printing multiple items with "one at a time" printing sequence you can customize the models independently or keep them all the same.
Scroll through the layer view to identify the order.

I recommend purging both extruders in the startup script or manually as the filament is retracted when starting, otherwise you get under-extrusion with mixing.

I'd like to note that occasionally Cura 3.6 doesn't like to print this correctly from USB, the G-code is good but it seems to ignore sending the new commands, I've been using Printrun from Ponterface to send the G-code over through USB and have had no issues. Printing with an SD card is also not a problem.
If you are experiencing a similar issue then try my method.

Please place ColorMix.py into the directory - {Cura executable}\plugins\PostProcessingPlugin\scripts.
You will need to restart Cura for it to be recognized.

Let me know your comments Pros/Cons.
I'm trying to get this into the official Cura build.
Enjoy!

History:
V1.0.0 - Initial release
V1.1.0 - Object number addition for customizing multiple prints
V1.2.0 - Fixed layer heights Cura starts at 1 while G-code starts at 0
Removed notes
Changed Units of measurement to Units
V1.2.1 - Fixed mm bug when not in multiples of layer height