You did it right then. The number you put in for unknown materials is both used for getting the camera as accurate as possible and setting the focus height unless you choose to manually change that in the settings. Personally, i’ve found the Cutting Without the Crumb Tray - The NO MATH Edition to work out great as long as you have set of calipers. All of the crumb trays seem to have slightly different heights and the creator of the guide you used made it specific to his glowforge and crumb tray.
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