I purchased a wood burning tool (like this one) and use it to “weld” the seams, then do some sanding. It’s a lot more post-processing than is typical for 3D printing but if you want something that looks nice, it’s hard to beat.
That's kinda genius. I never would have thought to use my soldering iron for that. (Of course, I am big dumb dumb.) I'll grab a sacrificial tip and give this a shot.