Leaderboard

There's a chamfer that runs through the middle of the ring of holes. The marks are from the way the printer handled the top layer on the inside half of that chamfer. On the outside, the filament was laid down in a series of nice, neat concentric circles in parallel with the outside diameter of the part. On the inside it looks like it has mushed in some infill in various criss-cross patterns rather than doing a neat top layer. The part probably needs some custom settings for those layers, to force it to use solid infill (although it should have handled that automatically).