Dry box Bowden guide

I found that a bowden tube quick release mounted directly to a dry box ground the edges of the filament slightly on the brass. This simple guide eliminates that issue and allows free feeding off the spool. outside threads are 1/2-13 and the inside threads are standard 6mm threads for the quick connect.

By request, I added a guide for 6mm OD 4mm ID tubes. The pass through threads require a 16mm hole and the pneumatic connector is 1/8 npt.