Abstract: Embodiments are directed to functionality for automatically trimming structural members in computer-aided design (CAD) models. An embodiment obtains a CAD model that includes a joint where a first structural member and a second structural member meet at an extremity of at least one of the first structural member and the second structural member. In turn, trimming is automatically applied to the joint using one or more processor executed rules. The one or more rules indicate the applied trimming based upon (i) geometry of the first structural member, (ii) geometry of the second structural member, and (iii) location of the joint where the first structural member and the second structural member meet.