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The red filament (the one I'm having trouble with) I started using minutes after taking it from the shrink-wrap/desiccant packaging. So I doubt it's moisture. Also the white filament's been out in the open in the room where I have the 3d printer for a month now without causing problems, so it doesn ...

I'm relatively new to 3d printing, and started out with the Rostock Max V2. I bought a few spools of filament along with the printer (all from a local shop that sells 3d printers). Unfortunately most of the rolls of filament aren't labeled with a brand, so I don't have a good way to identify them ...