I use Fusion to design stuff I think of. Works well for what I need it for.

that is nice. my AMS opens to air. Here is what we do with the purged filament waste: use silicone molds to mold colorful shapes. My kid then takes these to school and gives away to friends.Thanks for the cleaning tip. I'll keep that in mind.
The AMS has a built in heater/drier with desiccant. It's supposed to maintain a constant 55°C inside it. Any other spools will be kept in their sealed packaging.