Uninstalled within 2 hours I use a custom printer Anet A8
Cura 4.0 did not recognise it had 1.73 mm filament set for the printer.
Adding a custom material did not show up in the materials list when created.
Created unprintable gcode.
Seems like custom printers and filaments are just messed up, I recall this seemed to be an issue in a previous version, was it 2.4?