Four checks between your editor and your slicer.

Meshworthy is a macOS app that inspects a 3D model after you edit it and before you slice it. Each workflow covers one way a print fails: mesh defects, parts that do not fit, lost 3MF project data, and resin trapped inside a hollow. Every operation runs on your Mac and is re-checked in the exported file.

Get Meshworthy for Mac ↗Read the guides

Explainable STL repair

Repair STL files on Mac and see exactly what changed.

Find holes, non-manifold edges, flipped normals, self-intersections, and disconnected shells. Preview every proposed change before exporting a verified mesh.

Outcome: A repaired model you can inspect, compare, and trust.

What it checks

Exact diagnosis: Select an issue and Meshworthy takes you to the affected geometry.
Repair comparison: Compare before and after with changed regions and measured surface deviation.
Intent Guard: Protect real openings, sockets, text, and thin details before repair.
Verified export: The exported file is re-opened and checked before Meshworthy calls it complete.

Calibrated assembly

Split large STL models into parts that fit back together.

Fit oversized models to your real build volume, rank cleaner seams, add calibrated connectors, and print a test from the actual joint before the full project.

Outcome: Printable pieces, calibrated joinery, and a clear assembly plan.

What it checks

Printer-aware split: Use your build volume, margins, orientation, and fragile geometry instead of a generic cube grid.
Natural seam ranking: Prefer creases and less visible regions while protecting detailed surfaces.
Calibrated joinery: Tune clearance by printer and material instead of trusting a universal tolerance.
Actual-joint test: Export a small test containing the real final-scale connector before a long print.

3MF Semantic Guard

Edit 3MF geometry while tracking project data.

Inspect 3MF colors, materials, transforms, components, and extensions before editing. Know what is preserved, recomputed, or unsupported before export.

Outcome: A 3MF workflow that reports preserved, changed, and unsupported project data.

What it checks

Semantic inventory: See colors, materials, transforms, components, and slicer-specific project data.
Loss disclosure: Meshworthy tells you what an operation can preserve before it changes the model.
Required extension handling: An unsupported required extension blocks the operation and remains visible in the report.
Round-trip check: Exported semantics are compared against the promises shown before the edit.

Resin Safety Preflight

Hollow resin models without hiding a sealed failure inside.

Map every cavity, verify that drain and vent holes actually connect, protect fragile details, and recheck the model after every geometry change.

Outcome: A hollowing plan designed for reliable drainage, washing, and curing.

What it checks

Verified cavity graph: See every internal cavity, outside connection, bottleneck, drain, and vent.
Hole integrity: A visible hole only passes when it reaches the intended cavity in the exported result.
Keep Solid regions: Protect hair, fingers, cables, fire, and other details from unsafe global hollowing.
Dependent rechecks: Holes, scaling, splitting, and simplification automatically invalidate stale safety results.

What Meshworthy leaves to your slicer.

Meshworthy does not generate supports, print settings, toolpaths, or G-code. Keep using the slicer you already trust for those. Meshworthy prepares and verifies the model that you hand to it, and it does not upload that model anywhere.

New to the terms? The Mac preparation overview explains where preflight fits in a print workflow, and the changelog lists what has shipped.

Local model preparation

Know before you print.

On the Mac App Store. Diagnosis is free; Pro unlocks repair and preparation for $19.99, once, never a subscription.

Get Meshworthy for Mac ↗