I live in a house that's well over a hundred years old, and one of the bumpers from an old doorstop finally just disintegrated from age. I could have gone to a big box store and bought a cheap replacement doorstop, but ....wait... I've got a 3D printer!
Technical
I modeled this in 123D Design using only primitive shapes. A lip was included on the end so it would snap in place like the original one did. No adhesives required.