If you work with 3D files on Windows, you need to know this: Microsoft is permanently removing 3D Viewer from the Microsoft Store on July 1, 2026. Not deprecating it quietly. Removing it. You won’t be able to download or reinstall it after that date.

This is the last domino in Microsoft’s retreat from 3D. Paint 3D was removed in November 2024. 3D Builder is gone. Windows Mixed Reality is dead. The entire “Creators Update” era from 2017 is officially over.

Why This Matters If You 3D Print

If you’re like me — working with STL files from Thingiverse, Printables, or your own designs — 3D Viewer was the default quick-look tool on Windows. Double-click an STL, see what it looks like, decide if it’s worth slicing. Simple.

Microsoft’s suggested replacement is Babylon.js Sandbox, a browser-based viewer. Problem is, it doesn’t support STL files. The most common format in 3D printing, and their official alternative can’t open it.

What I Switched To

I’ve been using GeometryViewer for the past few months. It’s a browser-based 3D viewer that handles everything I throw at it:

  • STL, OBJ, GLB, GLTF, 3MF, FBX, PLY, STEP — basically every format that matters
  • Drag and drop, no install required
  • Works offline (it’s a PWA — install it once and it works without internet)
  • Measurement tools, cross-sections, material previews
  • You can share models via URL — useful when someone on Discord asks “does this model look right?”

The key thing for me: it handles STL files with proper normals and gives you a realistic material preview. I can see what a print will actually look like before I slice it.

The Full Timeline of Microsoft’s 3D Exit

For context, here’s how we got here:

Product Status
Remix 3D (model sharing) Shut down
Windows Mixed Reality Deprecated Dec 2023, removed in Win11 24H2
HoloLens 2 Production stopped Oct 2024, end of life 2028
Paint 3D Removed from Store November 4, 2024
3D Builder Removed
3D Viewer Removed from Store July 1, 2026

Every single component of the 2017 “3D for Everyone” initiative is now dead.

What About Existing Installs?

If you already have 3D Viewer installed, it won’t be auto-deleted. It’ll keep working. But you won’t get security patches, and if you do a clean Windows install or get a new PC, you can’t reinstall it.

There was also a serious security vulnerability (CVE-2024-20677) in 3D Viewer’s FBX parser — remote code execution with a CVSS score of 7.8. Microsoft’s fix was to permanently disable FBX support rather than fix the bug. That should tell you how much investment this app was getting.

My Recommendation

Don’t wait for July 1. Switch now and get used to a new workflow before the deadline. For 3D printing specifically, GeometryViewer is the closest thing to what 3D Viewer did, but it works in any browser and supports more formats.

If you need something heavier (textures, rigging, animation), Blender is obviously the answer — but that’s overkill for just previewing an STL before printing.

The era of Microsoft caring about 3D on the desktop is over. The good news is that browser-based tools have gotten good enough that we don’t really need them to.