This is my contribution to the everything-must-be-connected movement ;)

There is enough space in the case for a small development board like the Wemos D1 mini or Wemos D1 mini pro.

Update 12/02/2017 I have added a holder for the Wemos D1 mini that can be fixed with two zip ties.

Since there are many different solutions on how to power the printer I have added no hole for the power supply. Since the FreeCAD source files are included you can change the model to suit your needs.

All parts can be printed without supports.

Parts list / BOM:

Case

Case: The printed upper and lower part of this thing ;) Screws: 4 x M3x10 mm Bolts (from Aliexpress)

Button

Printed parts: http://www.thingiverse.com/thing:2293016 Button: 6x6x5 DIP-4 Push Button (from Aliexpress)

Printer, Microcontroller & other parts

Printer: 1x Mini Thermal receipt printer (from Aliexpress) Power supply: 5V 3A charger (from Aliexpress) Controller: Wemos D1 mini (from Aliexpress) Cables: Some male to male connectors (from Aliexpress)