Each 3d printer owner buys their printer for their own reason. Some of the most common reasons are that they enjoy making models or that they like to tinker and invent. I do both. I picked up a ceiling fan for $10. It was listed so cheap because it was missing a piece. A small plastic piece. Ha! I thought, this is perfect. I’m teaching my two boys about design, drafting (on paper) and cad drafting. This was a perfect real-world opportunity to have them put their skills to use. We looked up the OEM piece online, took some measurements on our parts to get the sizes right, sketched out some ideas on paper, then created some cad files. Bing bang boom! For about $0.05 we now have a working fan, but the lessons that they learned are worth so much.