Designed for this particular microwave shelf that is used to stack AMS units.

https://www.homedepot.com/p/Mind-Reader-Kitchen-Storage-Microwave-Stand-Shelf-Metal-Organizer-Rack-Shelf-1TCOUMIC-BLK/303579131

Adds extra height to allow lower AMS unit lid to fully open. Can also be used for single AMS unit up top, and filament driers below (which also need these feet to fully open)