Thanks to FreeCAD anyone can adapt this thing for his individual needs.
A simple case for an Arduino Uno, with included place for an LCD display (16x2 chars) and 9V battery holder, places for an encoder and On/Off swich. The USB connector is open, the external power supply of the Arduino Uno is hidden.
The 9V battery holder can easily be replaced by a holder for 4xAAA batteries which might provide longer power supply for the Arduino.
I'm using this case for an Intervallometer based on the Arduino Uno for my RX100M2.
Just print the upper and lower part it should be pretty self-explaining.
Use 3mm screws!