Since the laser source is static on the engraver, it will project to a very small central area at approximately 90 degrees with the best focus spot (0.05mm). As the laser moves to the edges and corners of the max engraving area (100mm x 100mm), the projection angle reduces and the laser spot becomes an oval, which means the focused power will be weaker and the engraving quality degrades. See Test #29: Faded Corners at Max Size and Test #44: Dealing with Faded Corners.
Another side effect is that when cutting large thick material, the bottom layer will be larger than the top layer. I’ve done some maths below to show what the differences are at the edge and corner with 3mm and 5mm thick material.
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