This is a super simple design, but I figured I’d share and maybe save someone else the 20 min it took to figure out measurements and design them.
These are risers (cut from 1/8" stock) that take up pretty minimal space when not in use. They’re sized for a crumb tray depth of 1.367"; one set for materials between 0.5" and 1.0" thick, and the other for materials between 1" and 1.5".
The itty bitty gray spot right here is the SVG file —>
Here’s what they look like: