ToolRecipe
Stays on this device No watermark Works offline

What do you need to get done?

Drop a file here

or .

/

Open an app

Follow a recipe

All recipes

Use one tool

All tools

Split STL by parts

Split an STL into its separate parts and save each one as its own file, one by one or all together as a ZIP. Useful when a model holds several pieces in one file. Free, online, and the model stays in your browser.

How to split an STL into parts

  1. 1Drop an STL, 3MF, OBJ or PLY file in
  2. 2See the parts found, each in its own colour
  3. 3Save a part with "Save", or all parts as a ZIP
  4. One STL per part, or a ZIP with all of them.

What happens to your model

  • Your model is not uploaded.It is read and split by your browser, on your own device.
  • Every part is listed.Triangles, volume, size and whether the part is closed, for each file.
  • Take one or take all.Save a single part, or all parts together in a ZIP named after your file.

What you can do

  • Find every loose piece in a model, shown in the 3D preview with a colour per part.
  • Save any part as its own STL, named like your file with "part01", "part02" and so on.
  • Save all parts at once with "Save all parts (ZIP)".
  • Check the size of each piece in millimetres, its volume in cm³ and its triangle count.
  • Open 3MF, OBJ and PLY files as well as STL. The parts are saved as STL.

Good to know

  • A part is a group of triangles that are joined to each other. Corners at exactly the same spot count as joined. Pieces that only come close stay separate parts.
  • If the model is one connected piece, the tool says so and there is nothing to split, so the ZIP button stays off.
  • A part that is not closed is marked "not closed". The STL repair tool can fix it.
  • Each part keeps its position in the original model, so the files fit together again in your slicer.

Questions

How do I split an STL into separate parts?

Drop the file in. The tool finds the separate pieces and lists them. Save each part, or all of them as a ZIP.

Can I cut a single solid piece in two?

No. This tool only separates pieces that are not joined. A model that is one connected body shows as one part.

Why would I split a model?

To print parts in different colours or materials, to lay them out on the bed one by one, or to work on a single piece.

Is my file uploaded?

No. The model is split in your browser and the files are saved on your own device.

Related tools

Recipes that use Split STL by parts

Split a model into its parts and make each one printableSplitRepairWeight3 steps

How it works

Small tools that run in your browser.

Four steps

  1. Start with a file or a task

    Drop a file, search, or pick a task.

  2. The tool opens in a window

    Open as many as you like, side by side as tabs.

  3. Results collect on the right

    Drag a result into the next tool.

  4. Save when you're done

    Saved files go to your downloads.

Who uses what

Tool sets for common jobs.

Put a tool on your home screen

The icon opens that tool, like an app.

iPhone and iPad

  1. Open the tool in Safari.
  2. Tap Share (the square with the arrow).
  3. Choose “Add to Home Screen”, then Add.

Android

  1. Open the tool in Chrome.
  2. Tap the menu (⋮) at the top right.
  3. Choose “Add to Home screen” or “Install app”.

Computer

  1. Open the tool in Chrome or Edge.
  2. Click the install icon in the address bar.
  3. Choose Install.

Skills

Claude skills we use ourselves, one job each.