K40 Laser Air Assist, radial fan, no screws, just clip on

thingiverse

This is a Air Assist for the well known k40 china laser. It has the following advantages over other constructions I found here: * it works with a radial fan, not with a diaphragm pump * It is not screwed to the laser head, but can simply be clip onto the lens nut. So you can easily remove it to measure the focus distance without screwing. * It prints without support, with an integrated break-off brim that is removed after printing. * The radial fan is used in 3D printers and can be connected to the 5V output of the board.