Bevel them again. Weld some of vertexes those are near to the another vertex, like this picture .


Inset the polygon that shows on the top and move vertex until make a QUADRANGULAR


And bevel them like it.


Then bevel & extrude and then chamfer the edges.


Ok , now  slice it 6  time and then select polygons and extrude them about -7 in local normal type

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