Tea night light voronoi

The tea light candle emits a nice voronoi pattern onto the wall next to it, it could also be hung. After watching a few tutorials about threads and voronoi i wanted to create a combination of the two and made this little tea light holder which my daughter loves. NOTE : The finished circle does not come out very smooth like it should. but it is unnoticeable at night with the light on which is its main function. Especially if cleaned up with a deburring tool. I tried different settings but it still came out pretty rough ( like the image below). The best result after printing 6 was with 0.16 layer height 3 walls and 10 % infill. I will experiment more with reducing speeds which i have not done yet and update if results are noticeably better. Would appreciate feedback of how to get a better quality finish for this shape from the more experienced community. Printed with a brim 6/6 success with a clean bed and threads worked wonderfully after cleaning the brim. Feel free to customize setting