Thank you. I tried that and found my project files were greyed-out in the list, implying they weren't in a supported format. When I looked closely I found they had not been given the .3mf extension! I have to manually put the .3mf extension at the end of the project files I save, then it works. At least I can save and open projects now so thank you.
Hi, I am using Cura 3.3.1 on a Mac and overall it works very well and produces brilliant prints. However, I am able to save a "project" file but then I am unable to open it. Strange, the option to open a project simply does not appear in the menu and I can't open it as a "file". Any ideas?