I need some help with the seam

Hello
I don’t give help because it seems not clear what you want. I can think of 3 kinds of print

    • A surface that is sliced (so just one path and a thickness of the extrusion diameter)
    • A volume that means some complex filament. I have done work to make solutions for that and plenty others exist.
    • A print that is not really derived from surface/volume like some clay/plastic extrusion where the filament is falling.

For me it looks like you are doing 1 and 3 at the same time. I don’t say it is not possible but doing something without clear designer (you) idea is not very useful.

You don’t want a seam make a surface. You need to adapt the slice thickness look here