Hi SUIYAN, in the future I would like to enable more cases where surfaces can get merged with Boolean Union. Currently it's only supported for 2 coplanar planes or when the 2 surfaces are trimmed pieces of the same larger underlying surface.

That has nothing to do with accuracy though.

If having larger surfaces are important for you, it would probably be better to create larger surfaces to begin with instead of making lots of little fragments.

- Michael