FreeCAD macro to export all visible parts as STL. Include all groups children.

export_all_stl.py

#
# Export Root Bodies and Objects Inside Root Groups to STL
#
# This is a FreeCAD script to export all visible root bodies and objects inside root groups in STL mesh format.
# Files will be stored inside an "exported_YYYY-MM-DD_HH-mm-ss" subfolder and named as "documentname_groupname_bodylabel.stl" or "documentname_bodylabel.stl".
#

import FreeCAD
import os.path
import datetime

doc = FreeCAD.activeDocument()

# Check if the document is saved (i.e., has a file name)
if not doc.FileName:
    FreeCAD.Console.PrintError("Document has not been saved. Please save the document first.\n")
    exit()

base_path = os.path.dirname(doc.FileName)
base_filename = os.path.splitext(os.path.basename(doc.FileName))[0]

# Get current date and time in the desired format
current_datetime = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M-%S")

# Ensure the "exported_YYYY-MM-DD_HH-mm-ss" subfolder exists
export_folder = os.path.join(base_path, f"exported_{current_datetime}")
if not os.path.exists(export_folder):
    os.makedirs(export_folder)

def export_object_to_stl(obj, prefix=""):
    if hasattr(obj, 'Shape') and obj.ViewObject.Visibility:
        # Remove any non-allowed characters from the label for file naming
        sanitized_label = ''.join(e for e in obj.Label if e.isalnum() or e in ['_', '-'])
        filename = os.path.join(export_folder, base_filename + "_" + prefix + sanitized_label + ".stl")
        try:
            obj.Shape.exportStl(filename)
            FreeCAD.Console.PrintMessage(f"Exported {filename}\n")
        except Exception as e:
            FreeCAD.Console.PrintError(f"Error exporting {filename}: {str(e)}\n")

for obj in doc.Objects:
    # Check if the object is a root object (not used by any other objects)
    if not obj.InList:
        if obj.TypeId == 'App::DocumentObjectGroup':
            # If it's a root group, export objects inside
            for sub_obj in obj.Group:
                export_object_to_stl(sub_obj, prefix=obj.Label + "_")
        else:
            # If it's a single root body
            export_object_to_stl(obj)