Machines, tools, furnaces, IoT devices, and myriad other technical wonders that I have built over the years.
Because if you want a thing made right,
you should have a robot to do it for you.
All kinds of glassblowing equipment that I have built - furnaces, ovens, hand tools, molds, blowpipes, etc.
A personal project of mine - making an IoT-enabling device for furnaces and other high-temperature equipment to connect them to the internet and enable data logging & remote monitoring.