A Clock Projector can project the time to a ceiling in the night.
There are lots of commercial alarm clocks with integrated clock projector on the market but I thought, it would be fun to build one myself.
Moreover it was a good project for becoming accustomed to the process of 3d-designing cases which can be 3d printed and to learn about designing tolerances.
Project website: https://microengineer.eu/2018/05/01/diy-night-clock-projector/
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