Portable Airhorn

Update 28-05: Convert the big Horn into a Siren Whistle (loud!) - fast and easy print!

Many thanks to all for the positive reactions and appreciation for this design!
Update 10-05: I have added a membrane cap with grip. Made by @Rotten_33336 at Printables. This is for easier installation if you do not manage to position the membrane cap right with the original one.

This little powerhouse knows how to produce a sound that will scare you.

Very easy printing. All parts can be printed without support.
I printed them with 0.4 nozzle and 0.2 layer thickness and 15% infill.
For the small horn I used a brim of 2mm, but it can be printed without brim.
Print all as positioned in the STL's.
Simple assembly without glue or rubber bands.