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Description

FreeCAD macro exporting smooth 3MF files and preserving all slicer print settings, with automatic workflow to your preferred slicer.

# This code is copied instead of the original macro code
# to guide the user to the online download page.
# Use it if the code of the macro is larger than 64 KB and cannot be included in the wiki
# or if the RAW code URL is somewhere else in the wiki.

from PySide import QtGui, QtCore

diag = QtGui.QMessageBox(QtGui.QMessageBox.Information,
    "Information",
    "This macro must be downloaded from this link\n"
    "\n"
    "https://raw.githubusercontent.com/2cv001/3D_printer_3mf_workflow/main/3D_Printer_3mf_Workflow.FCMacro" + "\n"
    "\n"
    "Quit this window to access the download page")

diag.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)
diag.setWindowModality(QtCore.Qt.ApplicationModal)
diag.exec_()

import webbrowser 
webbrowser.open("https://raw.githubusercontent.com/2cv001/3D_printer_3mf_workflow/main/3D_Printer_3mf_Workflow.FCMacro")

More detailed description:

https://github.com/2cv001/3D_printer_3mf_workflow/blob/main/README.md

Purpose

This macro automates and enhances the 3D printing workflow from FreeCAD to your slicer by:

• Generating smooth 3D prints without visible facets.
• Preserving print settings (temperature, supports, speed…) in a way that keeps them linked to the FreeCAD project.
• Launching external programs to streamline the full pipeline: FreeCAD → Slicer → Print.

This macro is the successor to macro 3d_printer_workflow.

The 3D_Printer_Workflow macro was already capable of producing smooth, facet‑free exports. Its main limitation was that it relied on STL files, which cannot store slicer or printing parameters.

This macro uses .3mf files, allowing all print settings to be saved and reused.

To retain the core functionality of the previous macro, this version also provides an STL export option with adjustable tessellation parameters, allowing smooth mesh generation just like before.

Limitation

The current version can export only a single object, but you can work around this by using links — for example, a Simple Group — to combine multiple objects into one.

Principle of smoothing

With visible facets

Without visible facets

The macro exports the selected objects to a 3MF file using the specified tessellation parameters (LinearDeflection and AngularDeflection). It generates temporary mesh objects for the export process and automatically removes them afterward.

Launching other programs or commands

The macro allows you to define custom commands that will be executed automatically after the 3MF file is generated. This feature is optional and can be used to automate additional steps in your workflow, such as:

• copying the generated 3MF file to another location
• turning on your 3D printer through a smart plug
• turn a light on
• pre‑heating the build plate
• sending an HTTP request to your home automation system
• launching a script or external tool

Principle diagram

Setup

A dedicated helper macro is provided to make configuration easy. Your commands are stored in an .ini file used by the workflow.

The ⚙️ button in the options window allows you to both install and open the configuration macro (3D_Printer_3mf_Workflow_ConfigIni.FCMacro).

• Fill in the fields in the configuration window
• Hover your mouse over a column title to display help tooltips
• Each command you define will be executed in order after the 3MF file is produced.

Using %PROJECT%, %PROJECTDIR%, and %PROJECTNAME% in user commands

When you define custom post‑processing commands in the workflow, you can use three special placeholders. These placeholders are automatically replaced by values derived from your FreeCAD project file.

Available placeholders

Placeholders and their meaning:

• %PROJECT%: Full path of the FreeCAD project without extension
• %PROJECTDIR%: Folder containing the FreeCAD project
• %PROJECTNAME%: Project file name without extension

Examples

Copy the generated 3MF file next to the project :

copy "%PROJECT%.3mf" "%PROJECTDIR%/backup/%PROJECTNAME%.3mf"

Run a script stored in the project folder :

python "%PROJECTDIR%/scripts/postprocess.py" "%PROJECT%.3mf"

Send an HTTP request using the project name :

curl "http://myserver/api/start?job=%PROJECTNAME%"

Turn on a Shelly smart plug Gen 1

curl "http://192.168.xxx.xxx/relay/0?turn=on"

Gen2

http://192.168.xxx.xxx/rpc/Switch.Set?id=0&on=true

Or if your device have a password :

curl -u admin:yourpassword "http://192.168.xxx.xx/rpc/Switch.Set?id=0&on=true"

Usage

More details at https://github.com/2cv001/3D_printer_3mf_workflow

Discussion

English : https://forum.freecad.org/viewtopic.php?t=102503

French : https://forum.freecad.org/viewtopic.php?t=103419

Script

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Code

ver 00.02 2026/02/14 by 2cv001 3D_Printer_3mf_Workflow.FCMacro

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