Hey guys,
I want to model a bicycle rim. I know that there are sometimes issues with boolean union, but I don´t know how to fix it. I tried many hours. I created the rim and now I want to add little rings for the spokes. But I cant union them together to one solid. Sometimes I can union some, and others not. When I open moI again, I can union one, and others not.. I don´t know how to fix it. I also tried first to union the solids together and did the b. diff afterwards, but then I get just a joined surface...
So, I tried many things, but I don´t know how it could run...
Maybe I am using the tool the wrong way?

I hope you can help me,

best regards from Hamburg

Koi