Improved Bottle Airlock For Brewing

I wanted to download an airlock to fit a standard UK 2L pop bottle that didnt require any rubber seals, bungs, or corks.
I found one (the original from this remix) but, seeing a few "leaking" comments, I decided it was time to help everyone with a remix.

The walls are thicker where needed, the openings smoother (to avoid buildup), and the threaded part is stronger to avoid the "splitting" or "cracking" issues others had reported. I also increased the thickness of the top cap to avoid it sticking open if your brewing burps a little somethingsomething back up because you didnt leave enough head space.

This fits perfectly on a standard or diet cola (the branded one - cant type it or this will get taken down - it sounds like "choke") without aid from anything else.

Print with 4 bottom and 4 top layers, and 4 walls on 0.2mm layers and she should be good to go.
PETG is what I used due to the slightly better robustness against cracking when tightened (dont go full terminator and wrench it