add: Grundlage für Umlenkrollen

parts/Kabelumlenkrollen.scad

+/*
+ * Umlenkrollen. Wie immer sind alle Angaben in mm
+*/
+include <lib/BasicFunctions.scad>;
+
+module spool(diameter, lenght, stone) {
+    $fn = get_render_correctness();
+    rotate_extrude(angle = 360, convexity = 2) {
+        difference () {
+            translate ([diameter / 4, 0, 0])
+                square([diameter / 2, lenght - 2 * stone], true);
+            translate ([(lenght - 2 * stone) +
+                        ((lenght - 2 * stone) / diameter) +
+                        (diameter/(lenght - 2 * stone)),
+                        0, 0])
+                circle(lenght - 2 * stone);
+        }
+    }
+    translate ([0, 0, (lenght / 2) - (stone / 2)])
+        linear_extrude(height=stone, center = true)
+            circle(diameter / 4);
+    translate ([0, 0, 0 - (lenght / 2) + (stone / 2)])
+        linear_extrude(height=stone, center = true)
+            circle(diameter / 4);
+}
+
+spool(30, 50, 5);
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parts/lib/BasicFunctions.scad

+function get_render_correctness() = ($preview == true) ? 15 : 360;
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parts/lib/RoundRect.scad

+include <BasicFunctions.scad>;
+
+module full_double_round_rect(size, radius) {
+    $fn = get_render_correctness() ;
+    x = size[0] - radius / 2;
+    y = size[1] - radius / 2;
+    z = size[2] - radius / 2;
+
+    translate([radius, radius, radius])
+        minkowski() {
+            cube(size=[x,y,z]);
+            sphere(r=radius);
+        }
+}
+
+module flat_round_rect(size, radius) {
+    $fn = get_render_correctness() ;
+    x = size[0] - radius / 2;
+    y = size[1] - radius / 2;
+    z = size[2];
+    
+    translate ([radius, radius, 0])
+        minkowski () {
+            cube(size=[x, y, z]);
+            cylinder(r=radius);
+        }
+}
+
+module half_double_round_rect(size, radius) {
+    union() {
+        full_double_round_rect(size, radius);
+        flat_round_rect([size[0], size[1], size[2] / 2], radius);
+    }
+}
+
+half_double_round_rect ([30, 40, 10], 5);
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