3D File Sorter

A free Windows desktop app for organizing your 3D print file library. Browse a folder of STL, 3MF, STEP, and ZIP files, then rename, move, and sort them into subfolders — all without leaving the app.

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MakerX 3D File Sorter — v2.2.1

New OBJ & PLY support · one-click AUTO sort · Sorted Items folder & Sort Check reviewer · in-app User Guide · Windows installer · No internet connection required after install

Windows 10 / 11  ·  64-bit  ·  Free  ·  Built-in update checker
Download (.exe) View Source User Guide (PDF)
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Windows SmartScreen Warning — Expected & Safe

When you run the installer, Windows Defender SmartScreen will show a blue "Windows protected your PC" dialog. This happens because the app is not signed with a paid Microsoft code-signing certificate — not because it contains anything harmful. The app is safe to install. The complete source code is published on GitHub so you can verify exactly what it does before running it.

To proceed past the warning:

1 Click “More info”
2 Click “Run anyway”
3 Installation proceeds normally

New & Improved

Version 2.0 adds the biggest time-saver yet — automatic sorting — plus flexible list ordering and instant preview.

New

AUTO Sort

Check AUTO sort in the top bar and the app instantly groups every file in the folder into category folders — Kitchen, Storage, Dragons, Halloween and dozens more, recognizing names in several languages. Each group gets a one-click Move All button, and anything it can’t confidently match is left in a clearly labeled Unsorted list at the bottom. It even suggests a brand-new group when it spots a recurring name, and remembers the groups you approve.

↕️ New

Sort by Name, Date or Size

A new Sort by control sits right next to the filter box. Order your files by name, modified date, or size — ascending or descending — so the one you’re after is always easy to find. Your choice is remembered the next time you open the app.

👁️ New

Tick to Preview

Ticking a file’s checkbox now loads it straight into the 3D viewer as well as selecting it — so you can eyeball a model and queue it for a bulk move in a single click. Move or delete the previewed file and the viewer clears itself automatically.

App Preview

Built for makers who accumulate hundreds of downloaded STL and 3MF files and need a fast way to sort them without hunting through Windows Explorer.

Click any image to enlarge

Everything It Does

A closer look at the tools built into every copy.

AUTO SORT button in the viewer toolbar, next to Check for Updates and Open Folder
AUTO sort — One click groups a folder into categories
Sort By dropdown in the sidebar set to Name, with Date and Size options and an ascending/descending toggle
Sort by — Order files by Name, Date or Size
Multiple files checked with bulk move folder picker open
Multi-select — Check files to bulk move or delete
ZIP file expanded showing STL and 3MF files inside
ZIP contents — Expand any ZIP to see what’s inside
Print estimate panel expanded showing material, infill, speed and filament cost settings
Tune the estimate — Material, infill, speed & cost tier

How to Use It

Download & Install

Download and run the installer above. See the SmartScreen note for how to get past the Windows security prompt.

Open a Folder

Click Open Folder in the toolbar or drop a folder onto the sidebar. The app scans and lists all supported files.

Browse Your Files

Scroll the sidebar to see all files. Use the new Sort by menu to order them by name, date or size, the search bar to filter by name, and click any ZIP to expand it and see what’s inside.

Auto-Sort a Folder

Tick AUTO sort in the top bar to group everything into category folders automatically, then hit Move All on each group. Approve a suggested new group and it’s remembered for next time; unmatched files wait in the Unsorted list.

Sort & Organize

Right-click a file to rename it, move it to a subfolder, create a new folder, or delete it. Or drag files directly onto folder targets.

Bulk Move & Delete

Tick the checkbox next to a file to preview it and add it to your selection. With several checked, use the action bar to move or delete them all at once — right-clicking any checked file applies the action to the whole selection.

Estimate Print Cost

Select any STL, 3MF, or STEP file to see a live print estimate — weight, filament length, print time, and cost. Adjust material, infill, speed, and filament price to match your setup.

Stay Up to Date

Click Check for Updates in the toolbar occasionally — new features and fixes are released regularly. The app will tell you if a newer version is available and link you straight to the download.

System requirements — Windows 10 or Windows 11 (64-bit). No internet connection required after install. Files are read and written directly on your local disk; nothing is uploaded anywhere.

Looking for the Browser Viewer?

The STL Viewer utility runs directly in your browser — no install needed. Load any STL file for a 3D preview with dimensions, triangle count, and volume.