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Fillable Windshield Washer tank for RC Car/truck
Separate the tank and the cap and trim away any excess parts from both.
Fill it with glass cleaner or actual Washer fluid and glue the cap on with a little contact cement (other glues might prevent you from reopening it should you need to refill) and bam, you have yourself a realistic scale washer fluid resevoir.
The Pictures of the print were done at home for tests prior to uplaod. The Shapeways print will look much better.
It needs to be printed in this "Frosted" Fine Detail plastic in order to be able to see the liquid inside.