The title explains by itself, the software is not saving my printer settings like volume, etc and also the parameters for slicing the model is not being saved.
I am able to save all my settings in 3.1.1 fine. What exact setting isn't saving? Maybe list the exact steps you are using to change it so others can try?
I have the exact same problems. Every time I start S3D, printer settings are wiped and the build area set to 0 x 0 x 0 mm. Also happened on 3.1, but the problem persists in 3.1.1. Throwing away all S3D settings files temporarily fixed the problem, so it seems like S3D is corrupting its own settings files, but it comes back after a random period of time. Currently running macOS Sierra.
The machine settings can be controlled by your profiles. So if you have a profile that has the "update machine definition" option checked, it could be responsible for changing the machine settings (and of course, if the volume was set to 0,0,0 in one of those profiles, that could cause this too)