A simple window stopper, for keeping your windows fully open while ventilating your room

The shape helps to keep the stopper in place, even if the windows is moving due to wind. It can be uses symmetrically.

I printed it in Armadillo TPU (https://ninjatek.com/shop/armadillo), a very hard TPU, but I think any material can be used.

To prevent damages on your window, while trying to close it with the stopper inside (this will happen sometimes at the beginning

It is 4cm wide at the thinnest point

UPDATE: I made the outer wall a little bit thicker, so that when printed in TPU, it won't squeeze together but rather slide a little bit better up and down (hopefully)