It looks like this problem: P1S Stops extruding mid print
After the initial filament load is used up, nothing extrudes anymore. Very small parts will print, bigger parts fail without any error.
I’m discussing this with BL support, so far it looks like an extruder motor or TH-board being faulty. So don’t blame your model just yet, see if it’s the size of the model (i.e. the amount of filament used) that makes a difference.