ContextCleaner: see every entry in the Windows 11 right-click menu, and which app added it — on the Microsoft Store.

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Guided workflow variation

STL repair for Windows 11,with nothing uploaded.

MeshMedic is a Windows app from the Microsoft Store. It repairs STL, OBJ, and 3MF files inside the app sandbox with no account and no network connection, and you buy it once after a 15-day free trial.

A single-purpose Windows app for one job: open the mesh, repair it, check it, and export a new file, with nothing leaving your PC.

Pay once. Own it forever.

One-time purchase on the Microsoft Store · No subscription · Instant install

Get it from Microsoft

Buy through the Microsoft Store—instant install, automatic updates, and a Microsoft receipt for easy expensing. No account needed on our site, and no subscription on Store purchases.

Full MeshMedic overview
One-time purchase No telemetry Local-first

windows · originals never overwritten · 3mf colors kept · nothing uploads

If this sounds like your week

You need a mesh fixed, not a new modeling hobby.

Repairing a mesh on a Windows PC usually means picking between heavy software and somebody else's server. Big 3D packages bury repair among sculpting, CAD, and rendering tools and often charge every year. Browser-based fixers are quick to try, yet they require handing over the model, which a print shop with customer work or an engineer under NDA cannot always do.

Where tooling usually breaks

The wrong tool turns a two-minute fix into a project.

Learning a full suite for an occasional broken file means relearning it every time the problem returns. Upload sites often add a sign-up, a size cap, and a wait for the download. And when either one applies a fix without showing it, you learn about a changed edge or a missing face only when the layers come off the bed.

Where MeshMedic lands

A Windows app that does the repair and nothing else.

MeshMedic installs from the Microsoft Store and runs on Windows 11 and on Windows 10 version 2004 or later. It reads STL, OBJ, and 3MF, repairs them in one pass, previews the outcome in 3D, and saves a new copy through the standard save dialog. It runs in the app sandbox, declares no capabilities, and makes no network connections at all.

Pay once. Own it forever.

One-time purchase on the Microsoft Store · No subscription · Instant install

Get it from Microsoft

Buy through the Microsoft Store—instant install, automatic updates, and a Microsoft receipt for easy expensing. No account needed on our site, and no subscription on Store purchases.

Learn more about MeshMedic

windows · originals never overwritten · 3mf colors kept · nothing uploads

What you get

Feature highlights

Every defect counted

non-manifold edges, inverted triangles, and holes for every part, in a table with Before, After, and Status columns, and No defects found for a clean file.

One repair pass

welds coincident vertices, removes degenerate and duplicate triangles, splits non-manifold edges and vertices, orients every shell outward, and caps holes.

Every change shown in 3D

triangles the repair flipped or added turn blue, and Show before switches back to the mesh as it was, with inverted triangles in red.

3MF projects kept intact

colors, materials, components, build items, metadata, and the thumbnail come through, and only the repaired mesh is rewritten.

A before and after note

the counts for every part and the triangles flipped, added, and removed, ready to copy or save as a .txt file for the job.

Originals never overwritten, nothing uploaded

every export is a new file in the same format, and the app makes no network connections and has no account.

Especially when

  • Repair holes, non-manifold edges, and inverted triangles in an STL, OBJ, or 3MF without rebuilding the model in CAD
  • See exactly what a repair changed, with counts before and after and every changed triangle shown in 3D
  • Repair a 3MF in place, keeping its colors, materials, components, and plate layout instead of converting it to STL
  • Keep customer and client models on the PC, with no upload, no account, and the original file never overwritten

Who benefits

Real-world scenarios

An engineer under an NDA

A contract engineer receives a client part as STL and needs it sliced for a prototype. The agreement forbids sending client files to outside services, and the company laptop runs Windows 11.

MeshMedic installs from the Microsoft Store, repairs the part offline, and writes the new STL to the project folder. The app has no account and makes no network connections, so the file never leaves the laptop.

A school makerspace

A teacher prepares student models for the class printer on a shared Windows 10 PC. Many student exports have holes or flipped faces, and the teacher wants a short routine anyone can follow.

The routine is three buttons: Open file, Repair, Export. The Recent list reopens last week's files without the picker, and each repaired copy is saved under a new name while the student's original stays as it was.

A shop that repairs a few files a week

A small print shop sees a handful of broken customer files every week and does not want a yearly subscription to a large modeling suite for that one task.

MeshMedic is a one-time purchase in the Microsoft Store, and the Store handles installs and updates. During the 15-day free trial the shop runs last month's problem files through it and compares the results.

Deep dive

What to look for in an STL repair app on Windows 11

The formats you actually get. Most files arrive as STL, but CAD exports and slicer projects arrive as 3MF, and older tools write OBJ. MeshMedic opens all three, reads binary and ASCII STL, and exports the same format it opened.

A count before and after. A repair you can measure is a repair you can check. MeshMedic's table lists non-manifold edges, inverted triangles, and holes with Before and After columns and a Status for every part, and a clean file says "No defects found".

A picture of the change. The 3D preview draws the triangles the repair flipped or added in blue. Show before switches back to the mesh as it arrived. Orbit with the mouse or the arrow keys, and zoom with the wheel or the plus and minus keys.

Your original left alone. Export always writes a new file. MeshMedic refuses to save over the original, even through a shortcut folder (junction), a hard link, a network path, or after the original was renamed.

Local and quiet. MeshMedic runs inside the Windows app sandbox and declares no capabilities. There is no account, no telemetry, and no network connection, and it reads only the files you pick.

Windows requirements. Windows 11, or Windows 10 version 2004 or later, on an x64 PC. A graphics card with Direct3D 11 is recommended for the preview, which falls back to software drawing without one. Plan on about 1 GB of available memory per million triangles; 8 GB of RAM covers meshes up to about 5 million triangles in binary STL, 3MF, or OBJ.

How you pay. MeshMedic is a one-time purchase in the Microsoft Store, which installs and updates it. The Store runs a 15-day free trial with every feature, so you can repair your own problem files before you buy.

How it is built

Built to change the mesh and nothing else.

Originals never overwritten

Every export is a new file you name. Saving over the original is refused, even through a junction, a hard link, a network path, or after the original was renamed or moved.

The rest of the 3MF untouched

Other entries in a 3MF package are copied byte for byte, and inside the model only the repaired vertices and triangles are replaced, so colors, materials, components, and build items come through.

Nothing uploads

MeshMedic runs in the Windows app sandbox with no declared capabilities, makes no network connections, and has no account and no telemetry. One-time purchase in the Microsoft Store.

Head-to-head

How MeshMedic compares

Feature MeshMedic Online repair service Full 3D modeling suite
Where the file goes Stays on this PC. Nothing uploads. Uploaded to the service Stays on this PC
Account None needed Usually required Often required
How it is paid for One-time purchase in the Microsoft Store Per file or per plan Often a yearly subscription
Steps to a repaired file Open file, Repair, Export Upload, wait, download Depends on the tools you learn
Record of the changes Before and After table and a note you can save Varies by service Usually up to you
Original file Never overwritten; a new file is written Your copy stays where it was Depends on how you save

FAQ

Straight answers—no glossary dump

Does MeshMedic run on Windows 11 and Windows 10?

Yes. It runs on Windows 11 and on Windows 10 version 2004 or later, on x64 PCs, and installs from the Microsoft Store with the runtime it needs. A Direct3D 11 graphics card is recommended for the 3D preview, which falls back to software drawing without one. The window opens at 1100 by 720 and works down to 960 by 600.

Can MeshMedic handle large meshes?

Yes. MeshMedic handles meshes with millions of triangles. Plan on about 1 GB of available memory per million triangles; a PC with 8 GB of RAM covers meshes up to about 5 million triangles in binary STL, 3MF, or OBJ. After a large file, MeshMedic hands its memory back to Windows when you open the next one.

How do I install and update MeshMedic?

From the Microsoft Store. Use the Store button on this page, start the 15-day free trial, and the Store installs MeshMedic with the Windows App SDK runtime it needs. The Store also delivers updates and, once you buy, keeps the license with your Microsoft account, so there is no license key to type into the app.

What happens to my original STL, OBJ, or 3MF file?

It stays exactly as it was. MeshMedic reads the whole file into memory when you open it and writes every repair to a new file you name in the Windows save dialog, with the original name plus -repaired suggested. Saving over the original is refused, even when you reach it through a shortcut folder (junction), a hard link, a network path, or after it was renamed or moved. You can repair the same original as often as you like.

Where do my files go, and how do I get MeshMedic?

They stay on your PC. MeshMedic runs in the Windows app sandbox with no declared capabilities, makes no network connections, has no account, and collects no telemetry. It opens only the files you pick and writes only the files you save. MeshMedic is a one-time purchase in the Microsoft Store, and the Store runs a 15-day free trial with every feature, so you can repair your own files before you buy.

Related pages

Repair a broken STL file, and see every change first. Repair the mesh inside a 3MF, and keep everything else. Fix the mesh errors before the slicer has to guess.

A broken STL or 3MF in.
A repaired file out, with every change shown.

MeshMedic counts holes, non-manifold edges, and inverted triangles, repairs them in one step, shows every changed triangle in 3D, and writes a new file in the same format, with a 3MF’s colors and components kept. Originals are never overwritten, nothing uploads, and the Microsoft Store runs a 15-day free trial.

Pay once. Own it forever.

One-time purchase on the Microsoft Store · No subscription · Instant install

Get it from Microsoft

Buy through the Microsoft Store—instant install, automatic updates, and a Microsoft receipt for easy expensing. No account needed on our site, and no subscription on Store purchases.

Open full product page

Technical specifications

Technical specifications for procurement

Spec Implementation
Data Sovereignty Reads only the STL, OBJ, or 3MF files you pick in the Windows open dialog; writes only the repaired file and the optional .txt note you name in the save dialog, refusing to save over the original by any path; the Recent list stays in the app’s own storage on this PC
Telemetry Status None; no account, no telemetry, and no network client in the app
Core Runtime .NET 10 and WinUI 3 (Windows App SDK 2.5), packaged as MSIX and run in an AppContainer with no declared capabilities; repair engine and STL, OBJ, and 3MF readers and writers in managed C#; 3D preview drawn with Direct3D 11
Network Requirements Fully functional offline; the package declares no capabilities, including no internet access, and the app makes no network connections
Deployment Compatibility Windows 10 version 2004 or later and Windows 11, x64; one-time purchase on the Microsoft Store with a 15-day free trial
Inputs STL (binary and ASCII), OBJ, and 3MF, picked in the Windows open dialog or reopened from the Recent list of the last 25 files
Checks Non-manifold edges, inverted triangles, and holes for every part, plus degenerate and duplicate triangles; Before, After, and Status columns; No defects found for a clean file
Repair Welds coincident vertices, removes degenerate and duplicate triangles, splits non-manifold edges and bow-tie vertices, clears stray fragments, orients every shell outward, and caps holes
Preview 3D view with repaired and added triangles in blue, inverted triangles in red, and a Show before toggle; orbit and zoom with the mouse or the keyboard
Outputs A new file in the same format: STL in its original binary or ASCII flavor; OBJ with objects, groups, materials, and smoothing groups; 3MF with colors, materials, components, build items, metadata, and thumbnail kept; plus a before and after note to copy or save as .txt
System Direct3D 11 graphics recommended, with software drawing as a fallback; about 1 GB of available memory per million triangles, and 8 GB of RAM covers meshes up to about 5 million triangles in binary STL, 3MF, or OBJ