Screwdriver assembly

This is a screwdriver I modeled off of a real screwdriver for a class assignment. It features four different interchangeable bits and the dimensions are as close as I could get them to the real screwdriver.

Note this screwdriver is not meant to be used and it would probably not come out well from a 3D printer as it was designed with the tolerances of the real screwdriver and the overhangs necessary to print would make it even more of a challenge. However, it does make a nice showpiece for your 3d printer regardless of functionality.

I am a novice designer and I'm new to Thingiverse so any feedback and critiques are welcome.