PTFE Coupling Plug

Plug for standard 4mm PTFE tube coupling. The plug holds a few centimeters of filament inside so you can pull it out with the plug without opening the drying box. The plug is tapered inside so it can grip standard 1,75mm filament and avoid it slipping out. Not airtight but better than leaving it open I think. 

I added a few versions with filament type inscribed. Looks fine with 0.2mm layer height. In case you are missing a version, you can use tinkercad to make a new one with the same font:

• tinkercad
• font type: sans
• font size: 10

Tapered inside to grip onto filament, changed opening from holding 4mm tube to fitting inside 4mm coupling.