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examples/spiral/twist_bottle.scad

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+use <box_extrude.scad>;
+
+/* [Basic] */
+
+shape = "Heart";  // [Flower, Circle, Heart]
+model = "Outer"; // [Outer, Inner]
+width = 30;
+radius = 20;
+height = 100;
+thickness = 1;
+spacing = 0.65;
+twist = 180;
+
+/* [Advanced] */
+
+slices = 200;
+   
+module twist_bottle(model, height, thickness, twist, spacing, slices) {
+    $fn = 48;
+    
+    module bottle() {
+        box_extrude(height = height + thickness, shell_thickness = thickness, twist = twist, slices = slices)
+            children(); 
+    }
+    
+    module inner_container() {
+        bottle()
+        offset(r = -thickness - spacing)     
+            children();
+
+        linear_extrude(thickness) 
+            children();          
+    }
+    
+    if(model == "Outer") {
+        bottle() 
+            children();
+    } else if(model == "Inner") {
+        inner_container() 
+            children();      
+    }
+} 
+
+module heart(radius, center = false) {
+    sin45 = sin(45);
+    cos45 = cos(45);
+    
+    module heart_sub_component(radius) {
+        diameter = radius * 2;
+        $fn = 48;
+
+        translate([-radius * cos45, 0, 0]) 
+        rotate(-45) {
+            circle(radius);
+            translate([0, -radius, 0]) 
+                square(diameter);
+        }
+    }
+    
+    
+    offsetX = center ? 0 : radius + radius * cos(45);
+    offsetY = center ? 1.5 * radius * sin45 - 0.5 * radius : 3 * radius * sin45;
+
+    translate([offsetX, offsetY, 0]) {
+        heart_sub_component(radius);
+        mirror([1, 0, 0]) heart_sub_component(radius);
+    }
+}
+
+if(shape == "Flower") {
+    twist_bottle(model, height, thickness, twist, spacing, slices) 
+    union() {
+        for(i = [0:3]) {
+            rotate(90 * i) 
+            translate([radius * 0.5, 0, 0]) 
+                circle(radius * 0.5);
+        }
+    }  
+} else if(shape == "Circle") {
+    twist_bottle(model, height, thickness, twist, spacing, slices) 
+    difference() {
+        circle(radius);
+        union() {
+            for(a = [0:120:240]) {
+                rotate(a) 
+                translate([radius, 0, 0]) 
+                    circle(radius / 4);
+            }
+        }
+    }
+} else if(shape == "Heart") {
+    twist_bottle(model, height, thickness, twist, spacing, slices) 
+        heart(radius * 1.9 / (3 * sin(45) + 1), center = true);
+}
+