it's consistently remarkable to me just how much difference it makes to have a very dry 3D printer filament
PCTG at ~30% RH (the measurement may be wrong but it spent about 24 hours in a relatively dry room after being taken out of the factory packaging) would popcorn so much that pieces of it would break off, get stuck to the nozzle, and foul the print
PCTG at ~18% RH (the measurement is probably closer since the heated chamber had time to equilibrate) has zero of these problems in much more print time than the above