The design of Chris Morgan worked well, but I had problems with the engravings at the bottom of the model. Following, I removed the engravings to make it printable. Probably there soon will be other improvements too.
Use:
Just slide an Arduino Uno into the bracket and mount the bracket anywhere with 3mm wood screws.
Print settings:
Nothing special… (I used 0.2mm layer hight and a 0.4mm nozzle)
The author remixed this model.