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It's Boximus Prime!
A cute and simple papercraft of G1 Optimus Prime that transforms.
If for some reason you have problems with that, here's just the template pdf file.
Right click and select Save Link As...
http://dl.dropbox.com/u/6356076/boxy transforming prime.pdf
Note: I did not design the template, I just printed and crafted it.
For a bigger detailed prime, check out my other videos, there are several Prime's, including one over a foot tall!