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[Mjolinor]

This is what I have in finned-rocket.scad taken from gedit.

$fn=100;


difference() { //removes cylinder from entire ducttaped model


union() {
cylinder (d=20,h=40);
translate([0,0,40]) cylinder(d1=20, d2=1, h=20);


hull() {
translate([-1,0,0]) cube([2,25,0.1]);
translate([-5,0,40]) cube([1.5,0.1,0.1]);
}


//second fin
rotate([0,0,120]) {
hull() {
translate([-1,0,0]) cube([2,25,0.1]);
translate([-5,0,40]) cube([1.5,0.1,0.1]);
}
} //end of rotate


//third fin
rotate([0,0,240]) {
hull() {
translate([-1,0,0]) cube([2,25,0.1]);
translate([-5,0,40]) cube([1.5,0.1,0.1]);
}
} //end of rotate
} //end of union to stitch the whole model together
cylinder (d=16,h=38); //removes hole for rocket motor
} //end of difference to remove hole for motor

It seems that "d" does not work on my scad.