This is a simple enclosure to be used during development of the Firefly Ice open source activity monitor.
Print the "Main Body" and "Back Plate". The top plate is a standard watch crystal. The inserts are 0-80 size (McMaster-Carr 92395A109). The screws are 3/16" 0-80 Flat Head with 82 degree bevel (McMaster-Carr 91253A030).
See http://fireflydesign.com for more information on the Open Source Firefly Activity Monitor Project.