Spool Rewind Airlock

A simple way to rewind the filament spool, with out losing the airtight integrity of the 4L cereal container dry-box with this grommet, collar and cap. The roller has a slot in one end, and used modifiers to add a fuzzy skin to give more grip, and 100% infill at each end for better strength. Drill a 10mm hole through the dry-box at the centre of the axle. Push the grommet through from the inside and screw on the collar. You can use a flat head screwdriver to roll the spool as you feed the filament back in. The cap can be screwed on to make it air tight again. Printing the roller and other parts in TPU adds a bit of extra grip and better seal. 

A simple way to rewind the filament spool for  GunplaMark's “The Ultimate Cereal Container Filament Drybox” design. This is an additional part and an original model.