3D printing - always one perimeter is NOT flat

[gavinD3 0]

Hi,

When I print cubes, they always have one side not flat at all. Especially the corner of that perimeter.

How does that happen? readjust the platform's level? the issue of nozzle?

And one more thing, how could I make the top sealed? It is like this all the time.

Thanks for help.

Just like this:

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[IRobertI 516]

That looks all kinds of messed up... What printer do you have? What settings did you use for the print? What plastic are you using?