From settings i have selected: "Show dialog to confirm selected spools before starting/resuming the print job" option.
Many times i don't get my spool collection popup, therefore can't print.
See this: https://www.youtube.com/watch?v=6eOClE6aVOo
I had spool selected, usually i have to do that many times, before spool selection comes for popup, this was first time when it was so easy.
Is this relevant to you? Looks like it's an issue where you try to start a print before the file has been analysed / some weird bug means the info about the file never gets updated.
@jesi Did you used 'print' or 'load and print'? Was the file analysed before the dialog was opened? It doesn't work when the filament data is not available.
@boelle There are plugins available for hardware filament sensors. The filament manager tries to do the same thing in software if the feature has been enabled.
I think I just found why people run into this issue as I did.
It's more a matter of not understanding and using the plugin correctly and the user interface being a little confusing, especially when not used that frequently. I've added a suggestion for improvement as wel.