I was truly convinced of the power of 3D printing a similar way a couple years back.. My 80+yo neighbor lost the back cover of her feature phone. I looked for a

I was truly convinced of the power of 3D printing a similar way a couple years back.. My 80+yo neighbor lost the back cover of her feature phone. I looked for a replacement but it's an old phone. She told someone at her church, who noted the model number. The following week, he brought her a 3D printed cover that fit perfectly. Over a month later and she was still talking about it. When you build a product that appeals to 20yo hackers and 80yo grandmas, you're onto something.