Artefacts with Cura and Printrbot metal simple

Hi,

I recently bought a new Printrbot 3D printer and I'm using Cura for my printing. The prints are acceptable but I'm getting a lot of artefacts like the fill structure is visible on the surface of the print and the layers are not that consistent.
Any ideas what I might be doing wrong? I''m attaching my Cura settings and print samples




Thanks!

Your top and bottom solid layers needs to go up, minimum of 4 layers 0.8

I use 4 solid layers for the bottom and 6 for the top.