Oral Air Horn

This is a 3d printed version of the buellboy492's "Sports Noisemaker" found on Instructables. See https://www.instructables.com/id/make-an-amazing-sports-noisemaker/

Amendments:
Added second T connector to change orientation of horns.
Added full STL with horns in different orientation
Added Chunky T Connectors, both vertical and horizontal. The originals were too hard to print...for me anyways.
Added Horn version 1.1. Increased the hole size my .2mm to make a better fit with t connector

Print instructions

Category: DIY Print Settings

Printer Brand: Prusa

Printer: i3 MK3

Rafts: No

Supports: Yes

Resolution: .15

Infill: 25%

Filament: Prusa Brand PETG Transparent Green
Notes:

Used PETG because that is the only green filament I have and I wanted to match my teams colours. GO RIDERS!!! PLA will probably work just as well. Sliced with simplify3d using the default Prusa profile for .15 resolution.

The horns do not need support material provided you print them wide side down. The original t connectors needs support material while the chunky ones do not.

Post-Printing

Just add a balloon and an elastic band.

Cover the wide open end with a balloon or a chunk of rubber glove to act as a diaphragm. Secure in place with a heavy elastic band.

Blow in the hole on the side and use it to cheer on your favourite sports team, scare the dog, wake up the wife. Whatever. Alternatively, print out two horns, and glue them to the T connector with CA and really get noisy.

Change the pitch by changing the tension of the diaphragm. Two different pitches together sound like a proper air horn.

The orientation of the horns in the assembled STL is setup the same as buellboy492's pillbottle variety but pointing them outward may have a better effect.

How I Designed This

Onshape

Yet another shameless plug for OnShape. Great program. Easy to use. Web based. Free. Fantastic tutorials.

If you want to modify this design you can find it at https://cad.onshape.com/documents/465bb16eac4912d051a9258c/w/7b3e1bc3ea70cc36f2aa82d7/e/a5bd33a907cf310d3359481b

You will have to open an onshape account. Did I mention it's free (for non commercial use only)

Custom Section

Think Big....or small.

This design is easily scale-able to several horns. You only need to redesign the T connector and add as many horns as you have lung power to actuate. I imagine if you scale the model down you will get higher pitches with less air.