Weaponized Cybernetic Makerbot

I, for one, welcome our new Makerbot overlords.
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I'm a huge fan of the LeFabShop robot, but I had one problem with it, aside from the lack of heavy artillery. Too much of the weight is in the back, so he can't stand up without falling back into a sitting position (most of the time.)
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I present to you my American version of the Maker Faire bot. The weight of the rocket moves his center of gravity forward. He also has a hollowed out compartment with opening and closing doors in h