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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.


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

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 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.



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.

Updated on: 04/08/2026

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