@acostas and I trying to enhance circular resolutions by making use of grayscales.
First, we tried to print a rectangular cross section shape with an inner rectangle in grey. However, the results are not as expected as the inside rectangle (the one in grey) is solid. However, it seems like the inner rectangle is not as high as the outside rectangle (colored in white). We are not able to measure the height at the moment so we can not give actual magnitudes for the heights. However, we are able to distinguish a boundary between both rectangles, which led us to assume that there exists a height difference.
Our hypothesis so far is that the inner rectangle received less curing energy so it developed as a "partial pixel" but in the "z" direction. Our goal is to create a grayscale in the XY plane, however this test seems to show that we can only create such grayscale in the z direction. We used 30 layers of 10 microns in order to make the grey and white rectangles.