I hate to admit that I have never been able to print any PVA with my Ultimaker S5. I have no problems with PLA and breakaway. But PVA, it always clogs the print core, immediately. I have tried BB0.4 and BB0.8, and both get clogged. I have cleaned the cores with cleaning filament until I got blue in the face. After cleaning, the PVA extrudes nicely for a meter or 2, and then it clogs again. It drives me crazy. What can I do???