Rubber band shooter
Here is a rubber band shooter I designed to hold and shoot 4+ rubber bands at a time. the cover is a tight fit and might take a little sanding on the edges of the post. You'll need to install a small rubber band from the front post and wrap it around the trigger to get it to return to its starting point.
Don't forget eye protection when playing with it!
Update: We just printed at 50% size for all of the parts in the slicer, and it is the perfect size for those mini rubber bands used to make bracelets (see the last picture), although I did have to drill each of the holes out a bit.