difference() {
     translate([0,0,0])
      cube([40,40,4]);
     translate([32,20,-1])
      cylinder(10,2.5,2.5,$fn=100);
     translate([12,7,-1])
      cylinder(10,2.5,2.5,$fn=100);
    translate([12,33,-1])
      cylinder(10,2.5,2.5,$fn=100);
}    
    translate([5,0,0])
     rotate([0,-90,0])
       cube([31,40,5]);
       
    translate([-14,0,18])
      *cube([18,40,13]);
      
difference() {
    translate([0,0,4])
     cube([20,40,4]);
    translate([12,7,-1])
      cylinder(10,2.5,2.5,$fn=100);
    translate([12,33,-1])
      cylinder(10,2.5,2.5,$fn=100);
    translate([12,7,4])
     cylinder(h=5,r1=0,r2=5,$fn=100);
    translate([12,33,4])
     cylinder(h=5,r1=0,r2=5,$fn=100);
}  
difference() {
    translate([0,12,4])
     cube([40,16,4]);
    translate([32,20,-1])
     cylinder(10,2.5,2.5,$fn=100);
    translate([32,20,4])
    cylinder(h=5,r1=0,r2=5,$fn=100);
}    
    b = 20;
    h = 22;
    w = 6;

//Start with an extruded triangle
   translate([5,20,8])
    rotate(a=[-90,-90,0])
	linear_extrude(height = w, center = true, convexity = 10, twist = 0)
		polygon(points=[[0,0],[h,0],[0,b]], paths=[[0,1,2]]);
        
pad = 0.1; // Заполнение для поддержки коллектора
box_l = 40; // Длина
box_w = 14; // Ширина
box_h = 13; // Высота
round_r = 2; // Радиус круга
round1_r = 2.5; //Отверстие под саморез
smooth = 200; // Количество граней окружности цилиндра
difference() {
    translate([-2,20,24.5])
     rotate(90,0,0)
     cube([box_l, box_w, box_h], center = true);
    translate([-5,4,22])
    cube([5,32,10]);
    
translate([0, -box_w/2+round_r, box_h/2-round_r]) {
difference() {
    translate([-9,5,15])
     rotate(a=[0,90,0])
      cube([box_l+2*pad, round_r*2+pad, round_r*2+pad], center = true);
    translate([-7,7,15])
     rotate(a=[0,0,90])
      cylinder(box_l+4*pad,round_r,round_r,center=true,$fn=smooth);
}
}
translate([0, -box_w/2+round_r, box_h/2-round_r]) {
difference() {
translate([-9,45,15])
rotate(a=[0,90,0])
cube([box_l+2*pad, round_r*2+pad, round_r*2+pad], center = true);
translate([-7,43,15])
rotate(a=[0,0,90])
cylinder(box_l+4*pad,round_r,round_r,center=true,$fn=smooth);
}
}
}