Steven Veltema shared on Thingiverse:

Customisable horn with attachement tabs

Customizable horns for cosplay.
Tired with limited number of fixed horn designs and want to light up a unique design of your own? Use the customizer to create a unique set of horns to really stand out from the crowd or remove the attachment tabs for use with other projects.

The result is a hollowed out horn with a specifiable inner radius and wall thickness constant across the entire length.

Note that extremely twisted designs may not be able to be printed correctly.

Thanks to adafruit for the idea and stevemedwin to inspire me to make it customizable.

Every Thursday is #3dthursday here at Adafruit! The DIY 3D printing community has passion and dedication for making solid objects from digital models. Recently, we have noticed electronics projects integrated with 3D printed enclosures, brackets, and sculptures, so each Thursday we celebrate and highlight these bold pioneers!

Have you considered building a 3D project around an Arduino or other microcontroller? How about printing a bracket to mount your Raspberry Pi to the back of your HD monitor? And don’t forget the countless LED projects that are possible when you are modeling your projects in 3D!