The Recalibration feature was designed to be used with a flat piece of medium Proofgrade Draftboard, used upside-down (with the QR code side down). It may work with other materials that are the same size and use the same print settings as well, like Proofgrade plywood. As @cynd11 mentioned, if you don’t have any full sheets of Proofgrade material, you can try it with a 12" x 20" piece of laser compatible material as long as it’s perfectly flat.
Since this doesn’t require follow-up from the Support team, I’m going to move this thread to the Everything Else section and leave it open to continue this discussion. Should you run into any other trouble, please start a new topic or email us at firstname.lastname@example.org and we’ll be happy to help.