Begin writing infills for printing

scad/Infill.scad

+
+
+defaultSize     =   3;
+defaultDensity  = 0.2;
+defaultStrength =   1;
+
+
+// TODO: write proper documentation about this!!!
+//
+// densitiy = 0…1
+// strength = material thickness
+// size = size of the generated infill volume
+//   -> size is calculated as 10^size for each axis
+//   -> therefore the generated volume includes at least the cube [10^size, 10^size, 10^size]
+
+
+
+// generates concentric vertival cylinders around the origin
+module concentricInfill(density=defaultDensity, strength=defaultStrength, size=defaultSize) {
+  
+  module ring(d, _str) {  // TODO: use d as outer diameter or as mean diameter…?
+    difference() {
+      circle(d=d + _str);
+      circle(d=d - _str);
+    }
+  }
+  
+  ring(11-2, 1);
+}
+
+concentricInfill($fn=100);