A few years ago I bought a replacement part for a baby stroller: https://www.shapeways.com/shops/bugabooparts
It's a neat business model: The person posts DIY repair videos on youtube, which drives traffic to his site. The strollers can easily cost $1000 new, and are often handed down / resold, so there is motivation to keep them running, and they have some weak spots which tend to break. The 3D printed replacement parts can be of superior quality to the original parts.