wall-mount adjustable air vent

This project has been a pain in the neck to produce ! Let's call it a challenge :-) !

The excellent original design comes from Hartvik (really nice, all of it, efficient design, simple and clean)

https://www.thingiverse.com/thing:3195581

I tried (hard) to adapt this design to my needs : a rounded wall-mount adjustable air vent instead of the squared original one.

But quickly, if the design is not WATER TIGHT (this is the important feature...), then cura ... makes it solid for you ! There's plastic filled everywhere... even where you don't want it ! Manually fixing the adapted design was getting time crazy. Adapting is rarely the way to go. Starting from scratch, always rewarding. Still. The screw design is scary !

So i had to pay special attention to make a water tight design (not a messy one...)

For reference I use the 2017 free version of sketchup. I used the "union" plugin (it works only on "solid" items).

Because i ve had no success "stealing" from Hartvik desi