Bifold door catproofer

thingiverse

This device glides effortlessly across the top of your bifold doors, settling precisely at the hinges to prevent the door from swinging open. It may also serve as a safeguard for dogs and small children, although forcing it could potentially damage either the door or the device itself. I manufactured mine using Hatchbox white PLA filament, yet most any type of plastic should be suitable for this purpose.