Print yourself a custom squeegee. An array of sizes here give you a degree of freedom, but if you need a truly custom length, just ask. Just print a handle and then the length you need.
No special materials needed. Choose your favourite.
This is designed to fit Unger squeegee rubber, which is available worldwide.
https://www.ungerglobal.com/en/pro-squeegee-rubber
I've just noticed that Thingiverse shows the rubber holders as upside down, so they'll need flipping before printing. Obviously that won't print like it is.
Handle.stl | 14.5MB | |
RubberGrabber_-_175mm.stl | 227.2KB | |
RubberGrabber_-_200mm.stl | 227.2KB | |
RubberGrabber_-_250mm.stl | 227.2KB | |
RubberGrabber__-_225mm.stl | 227.2KB |