The ability to shape the beam of a camera flash is nice and can be used to make interesting effects in your photos (especially if you shoot portraits, or you would like to lighten up a specific object in the frame). In stage lighting a pair of flaps, called barndoors, are often used to shape the beam of a spot light and I decided to make a 3D printed version for use with an external camera flash (this one is tailor-made for Nissin Di622). I used the open source OpenSCAD and InkSCAPE software and then InkScape to OpenSCAD converter (http://www.thingiverse.com/thing:25036). My printer is Velleman K5200 with the Repetier host. The inspiration came from pure laziness and not wanting to carry too much equipment for lighting when we do cos-play shoots. But I checked online to see if there is already available similar solution and I found that there is at least one company providing similar barn-doors for their own flashes only and some people who "modded" commercial barn-doors for strobes for use with an ordinary flash (http://www.nicephotomag.com/the-latest/the-10-no-mod-barn-door-for-your-flash).