I made this to snap into the corner of my bedroom windows, to avoid them from slamming due to wind. These are custom made for my specific windows, though I thought to share as you may only need minor modifications. I printed these in fluo orange to make it very visible not to forget to remove the bracket before trying to close the window.
Print Settings
Printer brand: Creality
Printer: Ender 3
Rafts:No
Supports: No
Resolution: 200
Infill:30
Filament brand: GST3D
Filament color: Fluo orange
Filament material: PLA+
Credits:
gunterlu