lc = 0.5;
Point(1) = {-0.35,-17.5,0.1,lc};
Point(2) = {0.35,-17.5,0.1,lc};
Point(3) = {0.35,-0.35,0.1,lc};
Point(4) = {17.5,-0.35,0.1,lc};
Point(5) = {17.5,0.35,0.1,lc};
Point(6) = {0.35,0.35,0.1,lc};
Point(7) = {0.35,17.5,0.1,lc};
Point(8) = {-0.35,17.5,0.1,lc};
Point(9) = {-0.35,0.35,0.1,lc};
Point(10) = {-17.5,0.35,0.1,lc};
Point(11) = {-17.5,-0.35,0.1,lc};
Point(12) = {-0.35,-0.35,0.1,lc};
Line(30) = {1,2};
Line(31) = {2,3};
Line(32) = {3,4};
Line(33) = {4,5};
Line(34) = {5,6};
Line(35) = {6,7};
Line(36) = {7,8};
Line(37) = {8,9};
Line(38) = {9,10};
Line(39) = {10,11};
Line(40) = {11,12};
Line(41) = {12,1};

Line Loop(42) = {33,34,35,36,37,38,39,40,41,30,31,32};
Plane Surface(43) = {42};

Extrude Surface {43, {0,0,-0.2}}  { 
  Layers { {5}, {1000}, {1} } ; 
} ;
