Simple desk tidy

I saw a similar design in Aldi the other day so decided to make one of my own. This was printed with Bambu Matt Marble. I will say that I'm not happy about how my print came out, its like there's a layer line between the horizontal base and upright. I'm sure there's a way to prevent this but am unsure as to how. If you know, please put it in the comments! Enjoy!