Dry Box with PTFE Tube Fittings

thingiverse

Lots of these to go around, here's my take. Fits PTFE tubing commonly used for 1.75 mm filament (4 mm outer, 2 mm inner diameter). The front part of the PTFE fitting base is threaded with DIN pipe threads, and fits these connectors: https://www.aliexpress.com/item/10PCS-Pneumatic-Connector-PC4-01-1-75mm-PTFE-Tube-Quick-Coupler-Feed-inlet-For-J-head/32808622940.html. The purpose of the inner funnel is to prevent sharp bends if filament isn't fed completely straight into the hole. This part can probably be omitted. All screw holes are M3, and you can use hot glue or window silicone to make installation air-tight. I used a thin neoprene tape gasket to seal the lid. The box used is called SmartStore Home 16, and the spool holder bracket is angled (86°) to fit this specific box. The tube used as spool holder is a 25.5 mm thick steel pipe that I had lying around. **UPDATE:** Added a stopper to prevent air from leaking into PTFE tubes when no filament is loaded.