Tech and engineering hobbies for people who like knowing how a thing works: 3D printing, coding, electronics, robotics, radio. 21 of them here, each with what it costs to start and how steep the learning curve is.












Maker and engineering hobbies are for people who want to understand and build systems. Programming side projects, wiring circuits, printing 3D models, building robots, or tuning a software-defined radio, these hobbies reward a methodical mind and a tolerance for debugging. The maker community is large and open-source, and entry-level kits cost less than most hobbies. If you like knowing how things work from the inside out, this is the category for you.