try this, should be simple to figure out afterwards
for e.g. get this STL:
https://www.thingiverse.com/download:1550926
load into S3D (notice if you slice it as it it will not work ok!!! this is multishell STL)
now go to app menu "Mesh" and select "Separate connected surfaces" (will take few seconds or few minutes depends on your cpu power)
instead of one model in the models window you will now have five!
you can click on the box left from the name to turn it on/off to see what model is what
now create separate process for each part:
1. create 5 processes with different infill
2. on each process click on "select models" and select different model for each process
now slice and preview
here are some sample pictures
https://cdn.pbrd.co/images/HaP3eoT.png
https://pasteboard.co/HaP3EN6.png
https://pasteboard.co/HaP3XVP.png
gcodestat integrates with Simplify3D and allow you to
Calculate print time accurately (acceleration, max speed, junction deviation all taken into consideration)
Embed M117 codes into G-Code
Upload your G-Code directly to Octoprint
open source and unlicence