Thank you for reaching out about the trouble with the lid. If the surface is unstable, uneven, or too small, then you could have inaccurate prints, the doors may not close properly, and the camera might be misaligned. Each Glowforge unit is tested on a flat surface. Many tables are not perfectly flat, which can create some friction when the lid closes. This is not harmful and does not require any changes.
If you would like to improve it, however, try inserting a spacer - for example 20 sheets of copy paper - under the center of the printer. If that doesn’t help, try moving the spacer to either edge. It may require some experimentation, including more or less paper, to find the arrangement with the least friction when it closes.
It sounds like you have already moved the unit and improved the position of the lid, so I’m going to close this thread. If you run into any more trouble, please start a new thread or reach out to us at firstname.lastname@example.org