I liked the material risers @Secret_Sauce posted, but not having a 3d printer and wanting something NOW, I made something similar in medium Draftboard. These risers were just made with a box generator and press-fit together tightly. I will glue them later, but they are going to hold up fine for tomorrow’s project.
(I made them so the 3 sizes of riser nest together, but it also might be nice if 3-4x of a particular height nested together.)
The 3 sizes are 2", 2.5", and 3" square. Here’s the SVG, but these are easy to crank out with your favorite box generator. You just have to know how tall to make them, which depends on the height of your crumb tray and the thickness of whatever you may be engraving. I determined my crumb tray was 1.350" off the deck and decided to use -0.5" and -1.0" risers like @Secret_Sauce did. His crumb tray was 1.38" I think, but I saw variation across my tray of more than that so maybe this is close 'nuff for your needs, too.
I used a cut width of .007". The press-fit is very tight. If you want it looser, which may require gluing, remake the risers in your favorite box generator and change that to .006-.005".
BTW, my calipers show these are about 0.002" taller than specified, but again the height of the crumb tray varies by a lot more than that so I am not too worried. I’ll certainly take extra steps to make sure I am spot on when placement is critical, which I’d do with the crumb tray anyway.
Risers in Draftboard.zip (18.2 KB)