I made these bats for my wife to decorate our house for Halloween. They are simple silhouettes with a 3rd dimension added for printing. I also added a loop at the top of each for hanging. The loop isn't perfectly balanced so you may want to move it around.
I've uploaded each whole bat and the sliced bats for printing on smaller printers. I made it so each bat half will snap together, but if you put it outside in the wind I recommend you glue the halves together, I found the snaps alone are not strong enough if the wind causes the bat to strike the side of your house.
To balance the bats better I found that I could change the infill percentage to adjust the weight. I set the infill for the smaller half to 30% and the infill for the larger half 20%, by doing this the bat will hang balanced without a need to move the loop.