One of the reasons I picked up my 3D Printer, was to create cool projects.
One such project, for photographers, is the LRTimelapse Pro-Timer. Coming from the man behind the LRTimelapse software, comes a custom built Intervalometer based on an Arduino Uno. This is a pretty cool open source project for the DIY fan that also loves photography.
This open source Intervalometer has all the features that were missing from other devices, best part, is that the design is free, and relatively easy to build. Use it to create all kinds of timelapses, or to stack images for a star trail photo.