Does anybody know how this new autosave option is supposed to work. I can't find any real documentation for it and it doesn't even come out in the help text.

I started up slicer, and exported the unchanged configuration to a file. I then exited slic3r and ran it again, but this time specifying --autosave and the file. I made a few changes to the config and exited without saving, checked the file, and sure enough my changes were there.

So next I recalled the same command line and ran it again (just the --autosave "file" option) thinking it would load that configuration and then save it again when I exited. It didn't - instead I was facing the original default configuration without the changes I made.

So now I recreated the same config file and ran slic3r again with --load and --autosave on the command line, both specifying the same config file. I figured it would load the file and then autosave it on exit. Instead, I was facing the same default config again. It's as if it ignored the --load option. Maybe I should have specified the --autosave before the --load, but I didn't try that.

Why can't there be a --preset option on the command line so that I can specify which preset files to use. It would be really great for host software integration if I could choose a printer preset and a filament preset and a print preset on the command line. I tried specifying three of those files using ---load multiple times as the documentation says you can, but it ignored them and sliced with a default configuration.