Honestly, painting it red would be far more likely to produce good results. Painting it would allow for covering layer lines and smoothing it out in general. Plus then the can match the red and put a high gloss or satin clear on itThis is a fantastic thread and set of instructions @kitkat, thank you!
I now need to buy a 3D printer and print the finishing piece in red to match my red leather. If that doesn't look quite right, then covering it with black alcantara might work well, too.