Door holder

thingiverse

To keep pesky doors or windows open with possibilities of a peg to block it, simply use this clever solution. This is not a safety lock in any way, but rather a means to keep old houses' crooked doors and walls from getting worse. This will NOT prevent a child from entering or exiting, it will only stop the door/window from moving by itself. A STEP file has been uploaded so you can easily adapt this solution to fit your specific door or window needs.