Clip for in window insect screen / inbouwhor klip

I could not find a vendor selling these bits, the screens are quite old. 
the plastic of the clips holding the screen in place have all deteriorated.

I used PLA but it's probably better to use a more weather resistant or a bit more sturdier material but it works for me :) 

On the photo on the right is the original clip. on the left is this model.