This is the tool to help you quickly determine whether or not your material is within the focus range with the honeycomb tray removed. No-Math Focus Ruler
It would be very helpful if the interface provided the focus height when the set focus tool is used, and this has been requested by other users. It would make it easier to do defocused engraves and scores. Until that happens, however, you can always do your own math if you measure precisely the distance the top of your honeycomb tray is from the bottom of the Glowforge. We used to have to do all sorts of computations before the set focus tool came along. Use the search function to follow many old threads regarding engraving without the honeycomb tray.