Been playing with PETg filament. And after getting it working and printing a rather nice coffee cup, I found my prints are not very waterproof using this stuff.
So I created some test pieces and got it working. It now holds water just fine.
EDIT: The ‘bad bridging’ is intentional to expose any leaking into the infill. See the desc in the link below for full details.
I suspect the problem has deeper roots than just fixing it with extrusion width(I suspect filament diameter and extruder calibrations of both being out a tiny amount.). But this also solves and will let me test the other problems later.
PETg is lots of fun, prints well, is very strong. The only downside is that it seems 40-50mm/s is about the fastest I can print without problems. And it’s a bit pricey compared to PLA/ABS.