I was replacing the windshield wipers on my car when I remembered seeing another thingiverse users' windshield wiper shower squeegee. His design was too big to fit on my printer and the blades that he used needed a lot of material to keep the squeegee straight. Here's my simple version of it.

I originally made this to use as a shower squeegee, but it works amazingly well on car windows. The blade contours to curves of the windshield.

Split in 3 parts for a small printer.

The squeegee part is the blade part of a used Bosch windshield wiper. I'm just using the rubber and springy metal strip it's attached to. There are other brands that look the same that may work. Bosch blades are OEM on most modern German cars.

You can use a 19mm dia. wood dowel for the middle section instead of the 3d printed version.