I’m a retired trucker (20 years) and have been a firearms instructor for 40+ years. I wanted visual aids for my classes that showed the inside of a cartridge. These are just not available anywhere. In January 2022 I ordered a 3D Printer (Ender 3 Neo) and learned to use it. I also learned to use TinkerCAD. My “Big Dummies” have sold well enough for me to buy better machines as they became available. I now have an Ender 3 V3 SE, Ender 3 V3 and an Ender 3 V3 Plus.