A repaired mesh can close a real opening, soften a face, or change a critical dimension.
STL repair and 3D print preflight for Mac
Repair the model and verify the result.
Find non-manifold edges, holes, scale risks, weak splits, lost 3MF data, and trapped resin before printing. Every check runs on your Mac.
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Free to try Pro $19.99 once, no subscription No uploads
See how it works Repair preview ready1 hole filled · change measured
⌁Local processingThe model remains on this Mac
◎Exact issue located1 open hole highlighted
Apple silicon supportSTL · OBJ · 3MF · PLYWorks with your slicerModels stay on your Mac
Visual inspection is not enough
A clean preview can still hide an expensive failure.
Slicers create toolpaths, while general mesh editors cover a much broader set of tasks. Meshworthy checks the model between editing and slicing so you can review the risks before committing material and time.
Generic clearances ignore your printer, material, orientation, and the actual joint geometry.
A geometry edit can erase 3MF paint, transforms, modifiers, or hours of setup.
A visible drain hole is meaningless if it never reaches the cavity it is meant to empty.
Four preparation workflows
Review each operation before export.
Inspect geometry, dimensions, assembly fit, file data, and resin cavities at the stage where each decision is made.
01↗
Repair review
Inspect every repair before export.
See the exact defect, preview changed regions, protect intentional openings, and recheck the exported result.02↗
Fit-tested assembly
Calibrate connections before the full print.
Split to your build volume, rank cleaner seams, calibrate joinery, and print the real connector before the full model.03↗
3MF integrity
Preserve project data during geometry edits.
Know whether colors, materials, transforms, components, modifiers, and project data survive every operation.04↗
Resin cavity analysis
Check every cavity and drain path.
Map internal pockets, verify drain paths, protect fragile details, and re-run safety checks after each edit.Preparation workflow
Inspect the model, review the operation, and verify the export.
- 1Drop in your model.
Open STL, OBJ, 3MF, or PLY. Nothing is uploaded.
- 2See the exact risk.
Click any finding to inspect the affected geometry and consequence.
- 3Preview the operation.
Compare changes, constraints, fit, and metadata impact before applying.
- 4Export and verify.
Meshworthy reopens the output and checks it against the result shown before export.
Preparation before slicing
A dedicated check before toolpath generation.
Continue using your preferred slicer for supports, print settings, and toolpaths. Meshworthy handles model inspection, controlled geometry changes, assembly planning, and export validation.
| What you need to know | Typical slicer | Browser utility | Meshworthy |
|---|---|---|---|
| Where is the exact defect? | Sometimes | Rarely | Click to inspect |
| What did repair change? | Result only | Result only | Visual and measured change map |
| Will this connector fit? | Generic tolerance | Generic tolerance | Printer profile and test coupon |
| Did 3MF project data survive? | Inconsistent | Partial | Semantic inventory |
| Does every resin cavity drain? | Manual judgment | Uncommon | Verified cavity graph |
| Where is the model processed? | Your device | Varies | Always on your Mac |
Local model processing
Your model remains on your Mac.
Geometry processing runs locally. Meshworthy does not require an account, upload models, or send them to a cloud repair service.
Read the plain-language privacy promise ↗Product information
Frequently asked questions.
What is 3D print preflight?+
Preflight checks a model before slicing for geometry defects, scale risks, printer-resolution limits, assembly fit, 3MF data loss, and resin cavities. Meshworthy prepares the model; your slicer still creates the toolpath.
Is Meshworthy an STL repair app?+
Yes, but repair is only one part. Meshworthy also explains what changed, splits oversized models with calibrated joinery, preserves supported 3MF semantics, and validates hollow resin geometry.
Does Meshworthy upload my 3D models?+
No. Model parsing, diagnostics, repair, splitting, hollowing, and export validation run locally on your Mac. There is no account and no model cloud.
Does it replace my slicer?+
No. Meshworthy prepares and checks the model before you open it in the slicer you already use.
How much will Meshworthy cost?+
Meshworthy is coming soon to the Mac App Store. At launch, it will be free to download: diagnosing a model, inspecting every defect in 3D, measuring, and exporting a clean copy will cost nothing. Meshworthy Pro will unlock repair, splitting, hollowing, orientation, and batch processing for $19.99 — a one-time purchase, never a subscription.
Which files does it support?+
Meshworthy supports STL, OBJ, 3MF, and PLY workflows, including units, transforms, colors, and materials stored in supported 3MF structures.
Technical guides
Practical 3D print preparation guides.
Understand non-manifold geometry, safe STL repair, model splitting, 3MF semantics, and hollow resin cavities through practical checklists for real files.
A seven-step workflow that protects design intent and verifies the exported result.
Match the repair to the exact edge, vertex, shell, or internal-face defect.
See what each format preserves and what can disappear during conversion or editing.
Use technical checklists before slicing, printing, and assembling the model.
Meshworthy for Mac
Know before you print.
Professional 3D print preparation is coming soon to Mac. At launch, diagnose any model for free and unlock the repair and preparation tools once, with no subscription.
Launch news and occasional product updates. No spam. Unsubscribe anytime. Privacy