Please suggest how to improve this print:

-There are a few "problems" - the uneven mess on the walls are caused by diagonal travel to the mounts in corners.
-some ooze (?) besides the columns inside, easy to break off
-And, the curved "half-pipe" in the bottom, have some "strings" directly diagonally, instead of a smooth overhanging edge.

May I guess there's loo little extruder reversing ? - what about the round overhang - filament did not stick properly to the layers beneath and took a shortcut in a few places - shoild it be printed slower ?

The round overhang can be caused by the following.

1) if its on the first layer it may be bed adhesion. Are you printing the first layer too far away from the bed? It needs to squeeze slightly on the bed otherwise the perimeter pulls away.

2) You might need to put up the extrusion a little bit on the perimeter printing . It looks like its not extruding enough and this stretches the filament across rather than bonding to the lower layer.

ok, thanks - no, it's not the first layer, and it's not an insane overhang.
So, show can I increase perimeter extrusion ?

The maximum overhang on a tight concave shape is less than it is for a convex shape and both are less than a straight edge. On convex curves the filament tends to curl upwards.

To lessen the effect you need not stretch the filament as much, which means slicing with a wider filament setting, or using a smaller nozzle.

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[www.hydraraptor.blogspot.com]

ok, thank you, the print is fully usable despite the few errors in the curved overhang.