This is a simple clock based on an Arduino Nano, an RTC module and a serial 7 segment LED display module. It has a fast and easy to use user interface with four buttons to set the time on the back side. The case is 3D printed in two halves that are screwed together with two M3 screws.
Only the STL-files for the case is available here on Thingiverse, schematic and Arduino code is available on my website here: http://axelsdiy.brinkeby.se/?page_id=1485
Added a slightly larger version of the main part of the case. This makes it a bit easier to fit the electronics.