add test tool

tool/magnetPolarityReference.scad

@@ -0,0 +1,41 @@
+include <../helper/common.scad>
+include <../helper/magnet.scad>
+
+
+doorPolarityReference();
+
+module doorPolarityReference() {
+  thickness = 3;
+
+  union() {
+    difference() {
+      minkowski() {
+        cube(size = [50, 8, thickness]);
+        cylinder(r = 2, h = eps);
+      }
+
+      union() {
+        translate(v = [9, 0, 1.1])
+        linear_extrude(2)
+        text("D", font = "Liberation Sans:style=Bold", size = 8);
+
+        translate(v=[31, 0, 1.1])
+        linear_extrude(2)
+        text("M",font="Liberation Sans:style=Bold", size=8);
+
+      }
+    }
+
+    translate(v = [3.5, 4, thickness])
+    magnetHolder();
+    translate(v = [46.5, 4, thickness])
+    magnetHolder();
+  }
+
+  module magnetHolder() {
+    difference() {
+      cylinder(r = magnetRSlacked+2, h = magnetHSlacked, $fn = 64);
+      cylinder(r = magnetRSlacked, h = magnetHSlacked, $fn = 64);
+    }
+  }
+}