PVA....Cannot live without it, cannot shoot the nozzle when it clogs....
Airbrush needle or something like that with a nice teeny tiny point.
Issues to overcome:
When printing and humidity strikes midprint, especially on long ones like I do on a constant basis
Humidity will clog the nozzle as PVA pops and crackles, creating a carbonized mess inside as well as outside the nozzle
If you pause the print to tr