/diy/ - Do It Yourself

>>2811272
It isn't bullshit, but it depends on when you consider a filament/part unusable. Some filaments will be immediately unprintable(PVA), Some can take a day or two to show issues (nylon), most can take months/years(PLA, PET, PC, TPU), and some may not be affected at all beyond how they smell when printing(ABS).
Most of the time it's an issue with stringing and surface finish, very rarely will it affect part strength. It mostly affects thin walls when it comes to strength, as on thin walls quality=strength.
tldr, Put your spool back in the bag it came with with it's desiccant pack and you'll probably be fine for quite a while.
Main reason I've embarked on this project if because I had nearly ten kilos of desiccant and no real application for it. So naturally, in order to use my free desiccant I went out and spent shitloads of time and money on tupperware, hygrometers, and filament dryers.