The plastic covers that go on the hinges of my windows got brittle so i designed new ones. Im no expert when it comes to windows but i think that these covers fit on newer european ones. Simply check out the pictures, if your window has the same hinges, these covers probably work for you.

Print everything standing up, only the file "Fenster Abdeckung Alt needs some supports. I attached a screenshot that shows where supports should go. The remaining prints should work without supports. 

Print the files with a 0.4mm nozzle or 0.25mm, bigger nozzles will not work.