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The arduino selection guide : https://learn.adafruit.com/adafruit-arduino-selection-guide

Definitely Eiffel Tower

I like : very clean light design with lot of space.
3D printing item i would like to receive with printer : http://www.thingiverse.com/thing:196038

- What is the most interesting thing you have seen done with a 3D printer or 3D printing technology?
Organovo's work on bio-printing. It could really be the replacement organ builders of the future....