Portable air conditioner latch
myminifactory
In this system a 3D printed latch and pawl are used to clamp a plate to the windowframe to seal it up. It allows you to lead the duct of a portable air conditioner out of a window, while keeping the window sealed to prevent warm outside air from entering the room. You'll almost certainly need to adjust the pawl to match the thickness of your sheet of wood/plastic, and adjust how far away from the plate it grips. Fusion360 file is provided for that purpose. If you need help adjusting it, let me know.
With this file you will be able to print Portable air conditioner latch with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Portable air conditioner latch.