You have (a friend with) a Batman fixation? You feel unsafe on your city’s streets? Don’t you worry, with this miniature Batsignal the dark knight will show up whenever you need him!
Images of the actual working thing will be added shortly as I forgot to take any and gave it away for Christmas.

Print all the parts, use superglue and screws (1m5; 2m3) to connect them in the right order (I’ll trust you on this one). Then disassemble a flashlight and glue the lamp in place. If you use an LED flashlight you want to cover it with aluminum foil in which you have punched a hole in the middle. This will enable your lamp to give a sharp and clean projection. To finish it, you might want to line the interior of the lamp with aluminum foil to make it brighter? (As I did this right away, I can’t tell you what purpose it serves, feel free to skip this step).
Glue the batteries into its dedicated spot in the base. That’s it!
-try to call batman, if he does not show up in 20 minutes you might want to get a brighter light….