Summary Enjoy! Source code for OpenScad: //CODE.... $fn=100; down(lenght=50); up(lenght=50); module down(lenght){ difference(){ cube([lenght,10,8]); translate([lenght-6,-1,12]) rotate([0,45,0]) cube([10,12,10]); translate([-9,-1,12]) rotate([0,45,0]) cube([10,12,10]); translate([-20,5,4]) rotate([45,0,0]) cube([lenght+10,10,10]); translate([lenght-10,2.4,0]) cube([11,5.2,10]); translate([lenght-4,10,4]) rotate([90,0,0]) cylinder(d=5.2, h=10 ); translate([lenght-11,2.4,0]) cube([8,5.2,10]); translate([-1,3,0])cube([5,4,2]); } } module up(lenght) { translate([2*lenght-8,0,8]) rotate([0,180,0]) union(){ translate([lenght-4,10,4]) rotate([90,0,0]) cylinder(d=4.8, h=10 ); translate([lenght-6.5,2.6,1]) cube([5,4.8,9.2]); translate([lenght-11,2.6,4]) cube([5,4.8,6.2]); translate([-0.2,0,0.2]) intersection(){ cube([lenght,10,8]); translate([-20,5,4]) rotate([45,0,0]) cube([lenght+10,10,10]); } translate([-0.3,0,8.2]) cube([lenght-8,10,2]); translate([-3.3,0,0.1]) cube([3,10,10.1]); translate([-0.6,3.5,1.9]) rotate([-90,0,0]) linear_extrude(3) polygon([[0,0],[1.5,0],[1.5,1],[0,1.8]]); } }