I recently backed the PrintDry project on Kickstarter: https://www.kickstarter.com/projects/730230926/printdry-filament-dryer?ref=user_menu
I must say that I was a little skeptical about the idea at first, but it has proven to work surprisingly well. I didn’t realize how quickly PLA absorbs water and the impact it has on print quality. The unit also provides a very handy ball-bearing supported filament feeder:
I’ve had several spools of old PLA that I’d almost thrown out because they produced very poor prints. The PrintDry has brought them back to life. Can highly recommend it!