You know the feeling: at first, our German Shepherd always slept in the bedroom, then she discovered the freedom of the entire house at night. But at night, she sneaks back into the bedroom and prefers to sleep behind the door. The only problem is: she closes the door with her butt and can't get back out. So she jumps on the doorknob to escape. Sleeping is overrated *laughs* 

So I designed this door clamp, which attaches to the top of the door and prevents it from closing. Printed with TPU, 2 walls, and 10% infill is perfectly sufficient.