The crane is a symbol of hope. This file is completely ready to print and requires no additional tools (except maybe a hammer) to be put together. This piece will bring you and those you success, good fortune, and happiness.
The $5 is a donation that will help me continue producing cool artgineering pieces, but the files can be downloaded for free as well from the above link. 15% of every purchase will be donated to the Sick Kids Hospital in Toronto.
This video shows how to put this beautiful moving sculpture together.