In my search for the perfect printing frame I have decided to make my own. Here is my list of requirements: 1. Even pressure across the whole glass area. 2. Fast printing. 3. Completely non-slipping. 4. When the "free" half of the back is opened for inspection and put back, it should not crunch the paper. 5. Several of them together should be stackable without fear of scratching the glass. So more to add to the list?