.geo file

// Gmsh project created on Mon Dec 11 18:31:08 2017
SetFactory("OpenCASCADE");
//+
Point(1) = {5, 5, 0, 1.0};
//+
Point(2) = {0, 5, 0, 1.0};
//+
Point(3) = {0, 0, 0, 1.0};
//+
Point(4) = {5, 0, 0, 1.0};
//+
Line(1) = {3, 2};
//+
Line(2) = {2, 1};
//+
Line(3) = {1, 4};
//+
Line(4) = {4, 3};
//+
Line Loop(1) = {2, 3, 4, 1};
//+
Plane Surface(1) = {1};
//+
Extrude {0, 0, 5} {
  Line{1};
}
//+
Extrude {0, 0, 5} {
  Line{2};
}
//+
Extrude {0, 0, 5} {
  Line{4};
}
//+
Circle(14) = {5, 2.5, 2.5, 0.5, 0, 2*Pi};
//+
Rotate {{1, 0, 0}, {5, 2.5, 2.5}, Pi/2} {
  Line{14};
}
//+
Rotate {{0, 0, 1}, {5, 2.5, 2.5}, Pi/2} {
  Line{14};
}
//+
Line(16) = {9, 8};
//+
Line Loop(6) = {11, 16, -9, 3};
//+
Line Loop(7) = {13, 7, 10, -16};
//+
Plane Surface(5) = {7};
//+
Line Loop(8) = {11, 16, -9, 3};
//+
Line Loop(9) = {14};
//+
Plane Surface(6) = {8, 9};
//+
Translate {20, 0, 0} {
  Duplicata { Surface{4}; Surface{3}; Surface{5}; Surface{2}; Surface{1}; Surface{6}; }
}
//+
Rotate {{0, 0, 1}, {22.5, 2.5, 0}, Pi} {
  Surface{9}; Surface{10}; Surface{11}; Surface{7}; Surface{8}; Surface{12};
}
//+
Extrude {15, 0, 0} {
  Line{14};
}
//+
Surface Loop ( 1 ) = { 1, 2, 3, 5, 4, 6, 13, 12, 11, 7, 10, 8, 9 };
//+
Volume ( 1 ) = { 1 };