Bird spikes
thingiverse
Spikes to mount on the roof or any other surface frequented by these flying rats ... erhm, pigeons. Print one base and 3 spikes. Spikes should slide in the grooves in the base, use a drop of superglue to hold them together. No supports needed, print from anything at any resolution ;) Not sure if PLA would withstand hot weather and other elements without wilting, so I used PETG.
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