Boolean operation BUG? I can not properly cut out holes with boolean modifier. Difference or Union looks very similar. The object with which I want to cut (5 cylinders) after cutting always sticks on the shape that I want to cut (after choosing difference). Tried flipping normals and triangulation modifier on all shapes. But nothing helps! Begging for some wise words!
Use a Solidify modifier to give thickness to your plate, apply it, then try again. Boolean needs thickness. If you don't want to give thickness to your object, use the Knife Project tool.