This lets you give that door a firm pull rather than a slam. Replaces the screen door catch that usually goes in this spot, and this model has a replacement catch built in.
I printed it in ABS and 100% infill, seems plenty strong. So far it's been sufficient to just screw it into the (plastic over foam) door, but you may need to use a toggle bolt or something if that doesn't work.
The author marked this model as their own original creation.