Easy Filament Cap

As I was missing some features in other designs, this cap for 4 mm bowdentubes was specifically designed for storage boxes. That means they don't have to be opened unnecessarily.Which means:The cap has a friction fit inside for the very end of your filament - if you pull it off the tube, it pulls out the filament too till you take it off from the filamentThe cap has a buffer of about 2 cm between tube grip and the end of the filament and can't be pushed in further with the cap, to easily