intersection()
{
    rotate_extrude()
    {
        translate([20,0,0]) square([4,2]);
    }
    hull()
    {
        rotate(0) cube([0.1,100,100]);
        rotate(90) cube([0.1,100,100]);
    }  
} 

This is an old subject. But this is what I use to solve it: intersection() { rotate_extrude() { translate([20,0,0]) square([4,2]); } hull() { rotate(0) cube([0.1,100,100]); rotate(90) cube([0.1,100,100]); } } -- View this message in context: http://forum.openscad.org/partial-rotate-extrude-tp2695p15153.html Sent from the OpenSCAD mailing list archive at Nabble.com.

Thanks to https://github.com/openscad/openscad/pull/1475 the dev snapshots now have an angle parameter for rotate_extrude(). ciao, Torsten.

if (EndAngle2-StartAngle2<360){

   NSides= (Faces < 3 || Faces==undef)  ?  DefaultFaces : Faces;
   n=floor((EndAngle2-StartAngle2)/120);
   Sect1=EndAngle2-StartAngle2-n*120;
   Sect2= (n>0) ? 120 : 0;
   Sect3=(n>1) ? 120 : 0;

   intersection(){
      rotate_extrude(convexity=2,

      union(){
         hull(){
	    rotate(StartAngle2) cube([0.001,Dout,Height+1]); 
	    rotate((StartAngle2+Sect1)) cube([0.001,Dout,Height+1]);
	 }
	 hull(){
	    rotate((StartAngle2+Sect1)) cube([0.001,Dout,Height+1]); 
	    rotate((StartAngle2+Sect1+Sect2)) cube([0.01,Dout,Height+1]);
	 }
	 hull(){
	    rotate((StartAngle2+Sect1+Sect2)) cube([0.001,Dout,Height+1]); 
	    rotate((StartAngle2+Sect1+Sect2+Sect3)) cube([0.001,Dout,Height+1]);
	 }
      }		
   }
} else { echo("Only rotations less than 360 degrees are supported");}

 intersection()
 {
     rotate_extrude()
     {
         translate([20,0,0]) square([4,2]);
     }
     hull()
     {
         rotate(0) cube([0.1,100,100]);
         rotate(90) cube([0.1,100,100]);
     }  
 }

Hi, I took some time to generalize your idea. Here it goes: DefaultFaces=24; module Tube_Sect(Height,Dout,Din,StartAngle,EndAngle,Faces) { StartAngle= (StartAngle < 0) ? 360+StartAngle : StartAngle; EndAngle= (EndAngle < 0) ? 360+EndAngle : EndAngle; EndAngle2 = (EndAngle < StartAngle) ? StartAngle : EndAngle; StartAngle2 = (EndAngle < StartAngle) ? EndAngle : StartAngle; if (EndAngle2-StartAngle2<360){ NSides= (Faces < 3 || Faces==undef) ? DefaultFaces : Faces; n=floor((EndAngle2-StartAngle2)/120); Sect1=EndAngle2-StartAngle2-n*120; Sect2= (n>0) ? 120 : 0; Sect3=(n>1) ? 120 : 0; intersection(){ rotate_extrude(convexity=2, $fn=floor(NSides*360/(EndAngle2-StartAngle2))) translate([Din/2,0,0]) square([(Dout-Din)/2,Height]); union(){ hull(){ rotate(StartAngle2) cube([0.001,Dout,Height+1]); rotate((StartAngle2+Sect1)) cube([0.001,Dout,Height+1]); } hull(){ rotate((StartAngle2+Sect1)) cube([0.001,Dout,Height+1]); rotate((StartAngle2+Sect1+Sect2)) cube([0.01,Dout,Height+1]); } hull(){ rotate((StartAngle2+Sect1+Sect2)) cube([0.001,Dout,Height+1]); rotate((StartAngle2+Sect1+Sect2+Sect3)) cube([0.001,Dout,Height+1]); } } } } else { echo("Only rotations less than 360 degrees are supported");} } //Examples: translate([30,0,0]) Tube_Sect(Height=20, Dout=30, Din=20, StartAngle=0, EndAngle=359.9999, Faces=3); translate([-30,0,0]) Tube_Sect(Height=20, Dout=30, Din=20, StartAngle=0, EndAngle=359.9999, Faces=5); //Left rotation Tube_Sect(Height=40,Dout=20,Din=12,StartAngle=0,EndAngle=259,Faces=20); translate([0,30,0]) //Right rotation Tube_Sect(Height=40,Dout=20,Din=12,StartAngle=-0.0001,EndAngle=-259,Faces=20); translate([0,-30,0]) //Complementary right rotation Tube_Sect(Height=40,Dout=20,Din=12,StartAngle=-0.0001,EndAngle=259,Faces=20); //Complementary left rotation translate([0,-60,0]) Tube_Sect(Height=40,Dout=20,Din=12,StartAngle=0,EndAngle=-259,Faces=20); Cheers, jpmendes Johan Jonker wrote > This is an old subject. But this is what I use to solve it: > > intersection() > { > rotate_extrude() > { > translate([20,0,0]) square([4,2]); > } > hull() > { > rotate(0) cube([0.1,100,100]); > rotate(90) cube([0.1,100,100]); > } > } -- View this message in context: http://forum.openscad.org/partial-rotate-extrude-tp2695p15161.html Sent from the OpenSCAD mailing list archive at Nabble.com.