It is a TF2 sentry published by Riddellikins in http://www.thingiverse.com/thing:44148 with a little modifications.
I just added a little front piece for colour and changed the position of other pieces for better printing in my iPrusa 3.
There are 2 diferrent shafts with different diameters. It depends on your printer what to print (I printed number 2 in my iPrusa 3). You can print both and test.
The parts with the word color as first word must be printed in color (blue o red as they are the tf2 colors).
Print the other parts in black.
Assemble using glue and enjoy.