How to Make Everything Ourselves: Open Modular Hardware
Nobody actually builds stuff that way, except for prototypes. But people do build things from T-slotted aluminum extrusions.[1]Their heating appliance designs are not too good. The one that heats a water vessel has liquids above a non-sealed box with electrical wiring. The toaster uses parts from another toaster, plus CNC milled plates and 3D printed parts. More expensive than a standard toaster, and looks iffy on electrical safety.[1] https://www.walmart.com/ip/80-20-1010-72-T-Slotted-Extrusion...