This is the Westar-34 Blaster, used by Jango Fett and his son, Boba Fett.

It is a fairly easy print, and if you machine tolerances are dialed in, most of the parts will snap in place, although I used CA glue just in case. Assembly is pretty straight forward, you can use the blow-up picture  to see where everything goes. The parts that need to be orientated a certain way are keyed. 

NOTE: I have the handle butt orientated for the best quality. If you have issues with it breaking off the supports, you can try to run it slower. If that doesn't work, you can turn it so that the bottom is on the build plate…but you will get some pretty ugly layer lines this way.

This is the way.