This is designed to work with an AC rocker switch/power inlet socket with fuse, similar to one of these: * http://www.robotdigg.com/product/744/AC-rocker-switch-power-inlet-socket-w/-fuse * https://www.amazon.com/TOOGOO-IEC320-Module-Rocker-Switch/dp/B00IIDXD1O * https://www.amazon.com/URBEST-10A-Rocker-Switch-IEC320-Module/dp/B00NWO68JI Note: the one from RobotDigg lights up and includes the fuse, but some of the ones from Amazon don't light and/or don't include the fuse! This is designed for 1515 extrusions which have 45mm of space between them (a little taller than the ones Johann designed, but which leaves enough room for a 30A power supply under the bed). Here is a link to my page describing my KosselPlus printer: http://www.kosselplus.com/ Here is a link to my modified version of Johann's lower corner/motor design: http://www.kosselplus.com/jcrocholl-kossel/frame_motor.stl And here is the OpenSCAD source for it: http://www.kosselplus.com/jcrocholl-kossel/frame_motor.scad And: http://www.kosselplus.com/jcrocholl-kossel/vertex.scad