Which gets to your 2nd purpose I don't love them. They don't keep spherical. To Enjoy it Protected you can't let them sit as part of your dryer and dispense from it. It's important to use the center whole as the reel both was not very spherical to get started https://spencerghabb.dreamyblogs.com/33418724/5-simple-techniques-for-3d-printer-filament