Bird spikes modular
thingiverse
Even if I redrawn it from scratch I'll still put the as a remix since I was strongly inspired by. What I've changed : -Added screw holes, so you can screw it in place with #4 or #6 -I also put a taper on the spike and on the key so they can't be pulled out -Some chamfer and fillet to make the thing look nice and be easy and fast to print ( I print them at 100mm/sec with no issue ) Those damn thing cost 60$ / 10ft in hardware store in Canada, if you're patient enough to print them you'll save some money.
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