Blender Addon using Better FBX Exporter to export in parent objects with respective children, filtered by name starting with a given value.

parent_better_exporter_fbx.py

"""
Install this Python script as addon in Blender to export parent objects with respective children
to separate files in batch.

Animations are not supported by default.

Find out more about Better FBX Exporter at: https://www.blendermarket.com/products/better-fbx-importer--exporter
"""

import bpy
import os

from bpy_extras.io_utils import ExportHelper
from bpy.props import (BoolProperty,
                       FloatProperty,
                       StringProperty,
                       EnumProperty,
                       CollectionProperty
                       )

bl_info = {
    "name": "Parent Better FBX Exporter",
    "author": "Marinho Brandao",
    "version": (0, 1, 0),
    "blender": (3, 0, 0),
    "location": "File > Import-Export",
    "description": "Batch Export Parent Objects to FBX including children with parents using Better FBX Exporter",
    "warning": "",
    "wiki_url": "",
    "tracker_url": "",
    "category": "Import-Export"
}

class Parent_FBX_Export(bpy.types.Operator, ExportHelper):
    bl_idname = "export_scene.parent_better_exporter_fbx"
    bl_label = "Export Parents as FBX"
    bl_options = {'PRESET', 'UNDO'}
    
    filename_ext = ".fbx"
    filter_glob = StringProperty(
            default="*.fbx",
            options={'HIDDEN'},
            )

    my_scale: FloatProperty(
        name = "Scale",
        description = "Scale all data",
        default = 100.0,
        min = 0.0001,
        max = 10000.0)

    starting_with: StringProperty(
        name = "Starting With",
        default="",
        )

    use_selection: BoolProperty(
            name="Selected Objects",
            description="Export selected objects on visible layers",
            default=False,
            )

    use_reset_mesh_origin: BoolProperty(
            name="Reset Mesh Origin",
            description="Reset mesh origin to zero",
            default=False,
            )

    use_animation: BoolProperty(
            name="Animation",
            description="Export animation",
            default=False,
            )

    def execute(self, context):
        collection_name = 'Collection'
        use_selection = True

        # get the folder
        folder_path = os.path.dirname(self.filepath)

        # get selected objects or scene objects
        context_objects = context.selected_objects if self.use_selection else context.scene.objects

        # filter to only parent objects (in the root of collections)
        parent_objects = get_only_parents(context_objects)

        for obj in parent_objects:
            if not obj.name.startswith(self.starting_with):
                continue

            # deselect all objects
            bpy.ops.object.select_all(action='DESELECT')

            obj.select_set(True)
            bpy.context.view_layer.objects.active = obj
            bpy.ops.object.select_grouped(extend=True, type='CHILDREN_RECURSIVE')

            file_path = os.path.join(folder_path, "{}.fbx".format(obj.name))

            # Export FBX with settings
            bpy.ops.better_export.fbx(
                filepath=file_path,
                use_selection=True,
                use_animation=self.use_animation,
                my_scale=self.my_scale,
                use_reset_mesh_origin=self.use_reset_mesh_origin,
            )

        return {'FINISHED'}


def get_only_parents(context_objects):
    children = [ob for ob in context_objects if ob.parent is None]
    return children 


def menu_func_import(self, context):
    self.layout.operator(Parent_FBX_Export.bl_idname, text="Export Parents with Better FBX Exporter (.fbx)")


def register():
    bpy.utils.register_class(Parent_FBX_Export)
    bpy.types.TOPBAR_MT_file_export.append(menu_func_import)


def unregister():
    bpy.utils.unregister_class(Parent_FBX_Export)
    bpy.types.TOPBAR_MT_file_export.remove(menu_func_import)


if __name__ == "__main__":
    register()

    # The menu can also be called from scripts
    bpy.ops.wm.call_menu(name=Parent_FBX_Export.bl_idname)