Scrapers
prusaprinters
These were originally designed for flat 3d print beds.They should be good for at least light frost, though I'm not sure how well they'll work on thicker ice or how well they'll work on the curved glass of a windshield.Their edges might degrade to a certain point, or just totally disintegrate. Let me know how well they work for you, if you decide to print one.
Download Model from prusaprinters
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