// Mobius strip
// allviews mobius
// viewsopts support
//Radius of strip
//use </home/clemence/projets/3dobjects/trunk/Writescad/Write.scad>
Radius = 20;
//Width of Strip
Width = 15;
//Thickness of strip
Thickness=2;
//Half twists 0 is a collar, 1 is the mobius strip, 2 = fulll twist
Halftwist=1; 
//Start Angle - important if Halftwist = 0
Start=90;
//Step size in degrees
Step = 5;

module mobius_strip(radius,width,thickness,step=1, halftwist=3,start=90) {
  for (i = [0:step:360])
    hull() {
       rotate([0,0,i])
          translate([radius,0,0])
             rotate([0,start+i * halftwist * 0.5, 0]) 
               cube([width,Delta,thickness], center=true);
       rotate([0,0,i+step])
          translate([radius,0,0])
             rotate([0,start+(i+step)* halftwist * 0.5 , 0]) 
               cube([width,Delta,thickness], center=true);
       }
}

Delta= 0.1;

module oneletter(letter,offy,rotatex,rotatez){
    //translate([2,-6,offz]) rotate([rotatex,0,rotatez])
    //        writesphere(letter, [0,0,0], h=7,t=2,19,font = "orbitron.dxf");
    rotate ([0,0,rotatez]) translate([0,30,0])
        rotate([90,0,180]) linear_extrude (5) text(letter,size=5);
}

difference(){
    union(){
        translate([0,0,8])
            mobius_strip(Radius, Width, Thickness, Step, Halftwist,Start);
        w=12;
        l=12;
        //translate([-Radius-l/2-1,-w/2,0]) cube([15,w,7.5]);
        height=22;
        outray=11;
        rcircle=4;
        translate([-Radius,0,0])
            rotate_extrude($fn=40){
                translate([outray-5,outray-5,0]) circle(r=rcircle);
            }
        *translate([2,-6,-4]) rotate([-30,0,50])
            writesphere("Myriam", [0,0,0], h=7,21,font = "orbitron.dxf");
        offa=180;
        oneletter("M",-4,-30,offa+0);
        oneletter("Y",-4,-30,offa+22);
        oneletter("R",-1,-20,offa+42);
        oneletter("I",6,0,offa+62);
        oneletter("A",0,0,offa+82);
        oneletter("M",0,0,offa+102);
    }
    ray=4;
    translate ([-Radius,0,-2]) cylinder (r=ray,h=30,$fn=40);
}