This is what it looks like when filament absorbs too much moisture. The water steams when the plastic is extruded, leaving bubbles and ragged edges. I left the spool out overnight, which usually isn’t a problem. I don’t know if the green happens to be more prone to absorption or not. I did notice that Solidoodle ships the spools shrink wrapped rather than in bags with desiccant.
I’ve had it in the tub with the dehumidifier rod for several days, and if it is still bubbling, I will try unspooling a couple layers and hope that the filament is drier further in the spool. If not, I can try drying it in the oven.