Drybox guide nut

I have found that the stronger plastic boxes can accept the m6 threads of the pneumatic couplings we all seem to use. But just incase I used a wide printed nut... I found the coupler would scratch the filament as it entered.

So, I made the nut deeper and added a fillet to help guide filament directly through to the coupler.

v2 nut is bigger and deeper to allow a smoother guide as the filament unwinds from max radius to min radius.

Freecad file also available