I used an app to make custom molded earbuds in only a minute
 

Earlier this week, we heard about the Revols, a pair of wireless earbuds that can be custom-fit to your ears in 60 seconds. In just a few short hours after it hit Kickstarter, Revols met and surpassed its $100,000 funding goal -- it's now earned a...

http://www.engadget.com/2015/11/11/revols-hands-on/