thingiverse
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.
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
This STL file is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
Yes, this model is available as a free download on thingiverse. Some creators accept tips or donations.
Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.