Export Groups in main collection of blender

export_kits.py

"""
  Exports all groups nested in the main scene collection as separate files.
  Useful e.g. for kitbash3d blend files
  
  * Modify the file to your needs (this uses FBX export to the same directory the blend file is residing)
  * Open Scripting, paste or load and run this script
  * Written and tested in Blender 2.8x
  * I as author take no responsibility whatsoever what you do with this script. Make Backups. Modify at your own will.
"""
import bpy
import os

# access the scene
scene = bpy.context.scene
current_path = os.path.dirname(bpy.data.filepath)

# you could select another path, like a subpath like this.
# save_path = os.path.join(current_path, "exp")
save_path = current_path

# start with empty selection
bpy.ops.object.select_all(action='DESELECT')

for group in scene.collection.children:
    # select group
    for o in group.all_objects:
        o.select_set(True)
    # export (as FBX, other exports can be used here)
    # other export functions documented: https://docs.blender.org/api/current/bpy.ops.export_scene.html
    bpy.ops.export_scene.fbx(filepath=os.path.join(save_path, group.name + '.fbx'), use_selection=True)
    # e.g. for .obj:
    # bpy.ops.export_scene.obj(filepath=os.path.join(save_path, group.name + '.obj'), use_selection=True)
    # unselect group
    for o in group.all_objects:
        o.select_set(False)

# show a message i am done.
# taken from https://blender.stackexchange.com/questions/109711/how-to-popup-simple-message-box-from-python-console
def ShowMessageBox(message = "", title = "Message Box", icon = 'INFO'):
    def draw(self, context):
        self.layout.label(text=message)
    bpy.context.window_manager.popup_menu(draw, title = title, icon = icon)

ShowMessageBox(f"Done exporting {len(scene.collection.children)} Children", "Export Script")