Some might know this, how to smooth out your lines on you 3D print. I tried sandpaper works depending the plastic using 300 grit or so. My goto is a scraper made by taking a large utility knife bade putting it in vice and use polished hardened steel bar to rub the edge of the blade over slightly. This forms sharp edge scraper and you can use it lightly to take off ugly lines. pulling the blade in reverse can be use of shine your work. Cheap blades seem to work better. For what its worth.