Build a desktop stand for your essential small tools.
Make your own Arduino-controlled color film processor.
Linear actuators are motors that work in a straight line. They’re very useful for controlling valves and levers, building robots,...
A simple cardboard adapter that can use a scanner to scan slides like ordinary documents.
Hide a secret flash drive in an innocent AA cell.
This very Bondian chessboard contains a secret compartment which only opens when you move the pieces in a certain way.
Simple and devilishly good.