module polea(){
color([0.9,0.5,0]){
translate([0,0,-3])cylinder(h=3, r=25, center=true);
translate([0,0,3])cylinder(h=3, r=25, center=true);
cylinder(h=4, r1=25,r2=22, center=true);
cylinder(h=4, r1=22,r2=25, center=true);
}
color([0.5,0.5,0.5]){
cylinder(h=70, r=2, $fn=20);
translate([0,0,-7])cylinder(h=2.5, r=3.5, $fn=20);	
translate([0,0,4])cylinder(h=2.5, r=3.5, $fn=6);
}
}
polea();