Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4897932.

UPDATE 12/21/2021: Now includes an All Files.zip file UPDATE 7/16/2021: A spring-loaded Hammer has been added. The Hammer retracts when the Trigger/Slide moves backward and returns as the Trigger/Slide moves forward. If you have previously printed this model and want the new feature, you will need to reprint the following parts: Left Side, Inner Frame, Right Side, Hammer, and Slide, plus 3 additional new parts, the Pivot Ring, Pivot Pin, and Pin. There are additional hardware requirements as well: details are in Miscellaneous Notes.

I really liked the original (kudos to tjsc5f), but I wanted hardware to hold it together.

So, I made some changes...

Added hardware: bolts/nuts/screws.

Added some (optional) press-in plugs to fill the visible hardware holes.

The Trigger/Slide is now spring loaded internally, so there is no pre-loading required.

The Barrel notch is gone in favor of a more traditional look.

The Safety is functional.

The Slide Lock is functional.

The Trigger got some holes.

The Hammer is spring loaded and returns after each shot. The motion of the Slide moves the Hammer via small bosses in the Slide, keeping the Rotor free to turn.

The Rotor is the square notch style from the bakewell remix, to which I added a flange on both sides to keep it centered in the Slide.

Changed the 3 plastic pins (Rotor, Hammer, Trigger) to 4mm x 14mm SS dowel pins.

A slide-out magazine, retained by magnets, holds additional rubber bands.

The end result is that it's a tad heavier, feels more solid when you hold it, maybe looks a bit more realistic, and shoots those #12 rubber bands very well.

And, you can load up 8 rubber bands.