By printing the smaller tree 0.4 mm above the base of the larger tree, it separates easily.  It then can be hung within the larger tree with an ornament hanger.  Kinda fun.  It's about 157 mm tall, so it's too large to be hung on a real tree as an ornament, but it can be a table decoration.

The conversation might revolve around how to get the smaller tree in or out of the larger tree.