For everyone else reading, just remember the height you enter into the Unknown Materials spot has to be the height from the top of the material to where the top of the tray would have been.
In other words, it has to be a number between 0.01 inches and 0.500 inches.
Looks like it’s going to automatically default to the limit if a number is entered incorrectly there.
All kinds of unpleasing calculations explained in the tutorial:
