OpenSCAD 建模：矿泉水瓶盖

　　下载地址：https://github.com/ZhangGaoxing/openscad-models/tree/master/BottleCap

　　代码：

module screw(r=){
    for(g=[::]){
        translate([cos(g)*r,sin(g)*r,(g)/])
        rotate(a=[,,g])
        cylinder(.,.,.,center=true,$fn=);
    }
}

module ring(h,r1,r2){
    difference(){
        cylinder(h,r1,r1,$fn=);
        cylinder(h,r2,r2,$fn=);
    }
}

union(){
    // Cylinder shell
    difference(){
        cylinder(,16.5,16.5,$fn=);
        translate([,,])cylinder(,15.5,15.5,$fn=);
    }
    // Patterns on the shell
    for(i=[:0.2:]){
        rotate(i*/,[,,])
        translate([,16.5,])
        cylinder(,.,.,$fn=);
    }
    // Washer
    translate([,,])ring(,12.5,);
    translate([,,])ring(,14.5,);
    // Screw
    union(){
        translate([,,])screw();
        translate([,,])rotate([,,])screw();
        translate([,,])rotate([,,])screw();
    }
}

　　效果图：