Roof drain screen
thingiverse
Spin this flat roof's drain problem solution by designing a roof drain screen that keeps large debris out. The custom-made screen has 1.5 inch openings for rainwater draining off the edge without clogging from leaves or other large debris. Although not tested yet, it's shared on a blog for others to try, and instructions are given on how to print, place, and maintain the screens on the roof. An update confirms its effectiveness with minor adjustments made to improve its durability.
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