Hello All, This is my first post on the OpenBuilds forum, but so far have been loving browsing the ideas some great minds have had. I'm currently working on designing a pallet system that will be belt driven through a series of machine components, and one of the many design constraints is that the top surface of the pallet (24" x 18") needs to be flat to .3 mm from its highest to lowest point. A leveling/adjustment mechanism is already being worked on, but the current challenge I foresee with this is the ability to measure this flatness so I know what adjustments need to be made. I had a few ideas in mind (using a positioning indicator probe on a gantry system, having a laser tripping system oriented parallel to the surface that's lowered at various X and Y increments), but would love to know if any of you have seen or created a flatness measuring system and would like to offer any insight. Thanks in advance, and good luck with all your builds!