Valve’s 2007 puzzle platformer Portal and its 2011 sequel may be well over a decade old, but makers and embedded systems enthusiasts continue to recreate the quirky murderous robots from the franchise to this day. And Dutch video game developer Joran de Raaff’s version of the Portal Turret may be the best one yet. What’s more, you can even make this at home thanks to its painstakingly comprehensive documentation.