[im] digital sundial clock, 3D print your own!

[János Sugár]

The sundial displays time (with actual digits !!) from 10:00 until 
16:00, updating every 20 minutes.

http://www.mojoptix.com/2015/10/25/mojoptix-001-digital-sundial/

https://www.thingiverse.com/thing:1068443