Bot Net: Ramshackle Robotics

The ship is disabled, the aliens have boarded, and slain everyone in sight! Help isnt coming, and its all on you to take up the roll of the hero, stop the aliens, and save the day. One problem... You arent a hero... You dont have an awesome suit of power armor, a big gun, or even a crowbar. You are the ships IT guy, and right now, youre locked in your office armed with nothing but a computer, a 3D printer, and a handful of janitor bots, hastily reprogrammed for combat. Your only hope for surviva...