DFM-Redesign

DFM-Redesign is a benchmark and pipeline for autonomous, intent-preserving design-for-manufacturing redesign of CAD parts. Given an engineer's CAD model, the method returns a variant that is easier to manufacture without losing design intent, produced as a sequence of individually verified design transitions rather than a single-shot redesign.

Two coupled agent subsystems driven by a pretrained multimodal LLM do the work: a DFM Reviewer inspects the current design and proposes one intent-preserving manufacturability improvement at a time, and a CAD Modifier executes each proposal as an edit to the part's CadQuery program. The Modifier closes a verification loop, compiling every candidate edit and visually checking it against the intended change from multi-view renderings, then re-generating or re-instructing until the edit is accepted or abandoned.

On a 46-part benchmark scored by chamfer distance to reference geometries, the CAD Modifier reproduces target parts more accurately on average than chain-of-thought single agents given the same tools. A centrifugal pump casing built from 32 chained transitions illustrates the complexity reachable by compounding verified edits. The paper states it is a preliminary report, with evaluation of the full review-and-redesign loop still ongoing.