The files are not modeled to be sharp. I sanded the prints down to have the blade feel to them and then painted. It worked better for me having thick layers so there was a decent amount of material to smooth out before it reaches the next layer. I found that .3 mm worked good for the layers. Also I set my printer so the top and bottom solid layers are more or equal to the total layer count so there is not infill grid printed. It needs to be 100% solid to sand properly.