Update #1: Bug fix in the Arduino program use version 1_0a
This is a laser projector (or POV display) based on 12 mirrors for displaying any alpha numeric characters. The projector as a clock in action can be seen at https://www.youtube.com/watch?v=KLzSlPYd9MY.
Usually the adjustment of the mirrors is very difficult and time demanding for a rotated mirror based laser projector. With this 3D-printed mirror wheel every mirror can be simply adjusted with a screw. It allows to use one or more lasers but the arduino I used isn't fast enough for more than two laser. The character size could be up to 12x8 dots even I use in my program only 8x5.
For the initial adjustment the program incorporates with http://www.thingiverse.com/thing:480487 but there are of course other possibilities. The projector has a large container on top this can be filled e.g. with coins in order to give it the necessary weight otherwise it starts to "walk around"
Everything is printed with 0.25mm without support. The side panel where treated with acetone in order to make them transparent.
All materials in the attached BOM. If you want to build one use a Fan with ball bearing (I didn't)