[Raul] built a cheap linear actuator out of a drawer slide and a surplus flatbed scanner. A few builds we’ve seen, like the PCB drill press or the horribly inefficient thermostat, used linear ...

[Will Finucane] of Revolt Labs/Mad Science Blog was looking for a way to keep his cats happily fed while away on a short vacation, so he put together a cheap and easy automatic feeder to ensure that ...