This is just a simple tilting mouse trap I came up with just to test out features like lettering, wall thickness, dimensions, and what clearances were possible on my 3d printer. This was my first print using what ever that factory defaults were in Simplify3D so I did get a lot of ghosting on the lettering and holes.
The bait plug in the rear is filled with peanut butter and once the critter enters the trap, the trap tilts and the door releases. The door uses a pair of 3/16" x 1/8" neodymium magnets to keep it closed. Weight (such as a coin or two) may need to be added to get the right balance.