Laser Pointer DIY

This laser pointer is very simple, just machine the housing and the lid then thread them(i guess you could 3D-print them to), then pop the 5 mW laser in (really cheap from ebay) and three AG10 button cell batteries, (adjust the housing for the batteries you want to use) solder one wire to each end of the laser with one of the wires going through the hole body to the lid and BANG, you just made a laser.