gkas wrote:Your spoilboard is not level.
Perhaps level is not quite the right word? It could be dead level and this still could happen---if the Z-axis of the machine is not perpendicular to the centre of the Earth.
Technically, I suppose, one could say the XY plane is not perpendicular to the travel of the Z axis at a set Z height. To sum it in a word I'd use: "true".
For the original poster: you probably should make sure, as gkas mentioned, that the spoilboard is surfaced true. But...
Notice that "Red" is almost OK but the letters around are less successful? This to me questions whether it really is an uneven spoilboard---why would it be that uneven is such a small area?
Was there a build up of Lucite on the bit? "Red" and "Merry Christmas" all look "smooshy" as if they were abraded/melted by "skudge" stuck to the bit. Perhaps they should actually look like 2018 and the other names?
Is the Lucite of a consistent thickness? Why are the faint letters still of an almost acceptable width but have no apparent depth?