Ceiling Projection Clock / Night light!

Ceiling Projection Clock / Night Light

The idea behind this was to create a nightlight/clock on the ceiling so that my children knew what time it was in the night – and stayed in bed!

The idea is to shine an LED through a ‘cut-out’ of the time (hours and minutes) and focus this onto the ceiling to show the time. As the time changes the ‘cut-out’ is moved to show the new time.
To do this I decided to have 2 wheels, one for hours and one for minutes. Each holds 12 ‘cut-outs’/stencils, one for each hour (1,2.. 11,12) and the other for each 5 minute interval (0,5…45,55). At night it is probably not necessary to know the time with better accuracy than 5 minutes. (For smaller children who can’t read numbers then these could be changed to suns, moons and other shapes!).

Since the resolution of a (my) 3D printer is not so great I decided to make the text approx. 1 cm high on a ¬20*20mm tile which could be slotted into each wheel.
To focus/image this onto a ceiling a lens is needed a