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sometimes if u extruded a cad file the walls get to be double lines extruded without a top covering or fillig , this is the case here and how can you fix it
we can create any new command or change command in3ds max:
for example create extrude command: menu customize > customize user inter face >
All command underneath
Example select extrude modifier then/ Hot Key: CTRL Press and hold +E than assign
u sould try shell command else weld vertices then exturde
Check all vertices and weld it properly befor extrusion
