The boolean problem

Hi Hillerl,

Yes, Booleans are tricky.

You are using an Addon (which is not wrong) and I don't know what it does exactly. There might be a Setting in the Modifers Tab, that needs to be changed.

Or moving the Cutters slightly...?

Booleans are finicky, you have to use them carefully, they tend to make a mess. Moving it around and changing the solver usually helps.