This model set turns an Action Army AAP-01 into an E11 from Star Wars. The AAP-01 slides into the 3D printed body and is secured with only a couple of bolts. The charging handle bolts onto the slide and reciprocates when firing.
In addition to the printed pieces you will need one M5x20mm bolt and a 1/4″x2″ clevis pin to connect the main pieces together.
This set includes twenty models in .stl format. Most of the pieces will need to be glued or welded to the main tubular body piece, while others are snapped over or are bolted on.