Standard desktop additive manufacturing forces a tradeoff: FDM is fast and cheap but leaves visible layer lines and limited surface fidelity; MSLA resin printing achieves near-injection-molded finish and fine detail but is slower, costlier per gram, and structurally more brittle at scale. Most makers and small manufacturers pick one process for an entire part, accepting whichever compromise it implies.

This entry proposes a split-interface hybrid manufacturing method: a single part's geometry is partitioned at the design stage into a structural body — printed in FDM for speed, strength, and low material cost — and a cosmetic/high-fidelity shell or insert — printed in MSLA resin for sub-100-micron detail, translucency, and mirror-grade surface finish where it's actually seen or touched. The two halves are joined via a [keyed/interlocking geometric joint reinforced with a compatible bonding agent], engineered so the interface tolerance accounts for FDM's layer resolution and resin shrinkage during post-cure, eliminating visible seams.
Novelty: while FDM+resin combination is occasionally used ad hoc by hobbyists, there is no standardized design methodology for where to split a part, how to tolerance the joint against each process's known dimensional behavior, and how to bond dissimilar-cure-chemistry materials reliably. This method turns an ad hoc workaround into a repeatable manufacturing process with defined design rules.

How it's produced:

Parts are modeled with the split plane defined by [functional/cosmetic zoning], each half sliced independently for its respective printer, printed in parallel, then joined using [method]. Total cycle time and material cost sit close to full-FDM production, while critical surfaces achieve resin-level finish — validated in [X] production runs of decorative display pieces.

Where it's applied:

The method was developed and validated producing decorative display cube/shelf pieces, but the underlying design rules generalize to any product needing selective high-fidelity surfaces at low bulk cost: jewelry and accessory prototyping, architectural scale models, dental/orthodontic study models, tabletop miniatures, and short-run consumer product prototyping — markets currently forced to choose between full-resin cost or full-FDM finish compromise.

Manufacturability:

Both processes are widely available on commodity desktop hardware (sub-$500 printers for each modality), meaning the method is immediately deployable by small manufacturers and prototyping shops without capital investment in industrial-grade single-process machines.

Marketability:

Rapid-prototyping bureaus, small-batch decor and jewelry brands, and hobbyist/miniature markets currently absorb the full cost premium of all-resin production or accept all-FDM finish quality. This method offers a cost-reduction path for the former and a quality-upgrade path for the latter, without new capital equipment.