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# The Fusion 360 integration: send designs straight to SimplyPrint

# The Fusion 360 integration: send designs straight to SimplyPrint

The SimplyPrint add-in for Autodesk Fusion 360 lets you export the active design and upload it to your SimplyPrint account in one click. Pick STL or 3MF, choose what to export, dial in the mesh quality, press **Send**, and the file lands in SimplyPrint ready to slice and print.

| Prefer to see it in action? Walk through the add-in in our [interactive demo](https://app.arcade.software/share/XKOboySknZAzXswjhlQK).

## What you can do
* Export `.STL`, `.OBJ`, or `.3MF` files directly to SimplyPrint
* Choose whether to start a print on one or multiple 3D printers
* Or queue the print
* Or save the file to your SimplyPrint cloud storage
${frame}[SimplyPrint Fusion extension - interactive demo](https://demo.arcade.software/XKOboySknZAzXswjhlQK?embed&embed_mobile=tab&embed_desktop=inline&show_copy_link=false)
## Install
The add-in lives on the Autodesk App Store - install it in a couple of clicks on both Windows and macOS.

1. Open the [SimplyPrint add-in on the Autodesk App Store](https://apps.autodesk.com/FUSION/en/Detail/Index?mode=preview&id=7718157501864888513&appLang=en) and click **Download**.
2. Close Fusion 360, then run the downloaded installer. It drops the add-in into Fusion's AddIns folder for you on Windows or macOS.
3. Open Fusion 360.
4. Press **Shift+S** to open the **Scripts and Add-Ins** dialog, then switch to the **Add-Ins** tab.
5. Select **SimplyPrintExport** in the list, click **Run**, and tick **Run on Startup** so it loads automatically in future sessions.

Once active, the **SimplyPrint** button appears on the **UTILITIES** panel and next to Fusion's built-in 3D Print button on the **MAKE** panel.

## How to send a design to SimplyPrint
1. Open the design you want to print in Fusion 360.
2. Click the **SimplyPrint** button on the **UTILITIES** panel. The export dialog opens on the right.
3. The first time you use the add-in, click **Log in** under **SimplyPrint account**. Your browser opens SimplyPrint's sign-in page - approve the request and return to Fusion. You stay signed in for future exports.
4. Configure the export options (see below), then click **Send**.
5. SimplyPrint opens in your browser with the file pre-loaded. From there you can save it to your cloud storage, slice it, queue it, or start a print on one or more printers.

![](https://storage.crisp.chat/users/helpdesk/website/-/f/f/2/2/ff22a914001c1000/01-export-panel_y0jfq9.png)

## Export options explained

### Format
| Option | When to use |
| ---- |
| **STL** | Universal mesh format. Pick this if you're not sure - every slicer reads it. |
| **3MF** | Newer format that preserves units, colour, and per-body metadata. Better for multi-body or multi-material prints. |

### Scope
| Option | What it exports |
| ---- |
| **Entire design** | Every body in the active design. |
| **Selected bodies** | Only the bodies you pick in the canvas. A picker appears below the dropdown. |
| **Selected components** | Only the components you pick in the canvas. |

### Visible only
When checked, hidden bodies are skipped even if they fall inside your scope. Use this to quickly hide construction geometry without unselecting it.

### One file per body
When checked, each body exports as its own file (and each gets its own card in SimplyPrint). Off by default - everything bundles into a single STL or 3MF.

### Mesh quality
Controls how finely Fusion tessellates the design into triangles. Higher quality means smoother curves and larger files.

| Preset | What you get |
| ---- |
| **Low** | Fast export, larger triangles. Good for quick test prints. |
| **Medium** | Balanced - the recommended default for most prints. |
| **High** | Fine detail, larger file. Best for show-piece prints with curved surfaces. |
| **Custom** | Exposes surface deviation, normal deviation, aspect ratio, and max edge length sliders for full control. |

## Logging out or switching accounts
Open the SimplyPrint dialog in Fusion, expand the **SimplyPrint account** group, and click **Log out**. Your stored token is cleared and you can sign in with a different account next time. Signing out in Fusion doesn't affect any other SimplyPrint plugins you may have installed (Blender, SketchUp, etc.) - each handles its own session.

## Uninstall
1. In Fusion, press **Shift+S** to open the **Scripts and Add-Ins** dialog. Open the **Add-Ins** tab, select **SimplyPrintExport**, and click **Stop**. Untick **Run on Startup** so it doesn't reload next launch.
2. On Windows, open **Add or remove programs**, find **SimplyPrintExport**, and uninstall it from there. On macOS, remove the **SimplyPrintExport** add-in from Fusion's AddIns folder.
3. Optionally delete `~/.simplyprint/oauth_fusion.json` and `~/.simplyprint/fusion/` to remove the stored token and preferences.

## Troubleshooting
* **Sign-in window opens but never returns.** Your browser may be blocking the localhost redirect. Try a different browser, or paste the printed authorize URL into the browser manually.
* **"Could not start callback server."** Another process is using the local port the add-in needs. Close any other Fusion sessions or restart your computer.
* **The Send button doesn't do anything.** Check the **Status** field at the bottom of the dialog - upload errors show up there. The most common cause is being signed out, so confirm you see **Signed in as ...** at the top.
* **The SimplyPrint button is missing from the toolbar.** Press **Shift+S**, open the **Add-Ins** tab, select **SimplyPrintExport**, and click **Run**. If it's not in the list, Fusion can't find the add-in folder - re-add it using the green **+** button (manual install) or rerun the installer.