In the last time doves makes some problems. They liked my satelite dish very much. With the result, that my terrace and balcony get a lot of pigeon dirt. This is not beautiful, nor is it very healthy.
So I created many "lace needles" with different angels and attachments.
3D-Printing is the right choise, because you can't use a metal here and you can't bye this things. I hope someone helps this idea.
Print: PETG or ABS for outside use.