A simple stand allows you to stack two AMS without screws or other parts. Because I find that when you have more than one AMS you no longer need to change filaments as often, and lifting the top AMS is not a difficult task. This stand solves the AMS stacking problem with minimal volume and filament.
It is worth mentioning that I designed some elasticated mechanisms, which allows the weight to be spread as evenly as possible over the dome of the AMS underneath. You can apply some rubber tape to the rounded surface to prevent scratches and slippage.
Some double sided tape on the bottom of the AMS above will make the joint more secure.
Print with any material you have. No support needed.