Path reorg

v1/scad/lib/util/hexagon.scad

@@ -0,0 +1,5 @@
+module hexagon(inradius) {
+    circle(r=2 * inradius / sqrt(3), $fn=6);
+}
+
+hexagon(inradius=2.8);

v1/scad/lib/util/screw_hole_m3.scad

@@ -0,0 +1,30 @@
+use <hexagon.scad>
+
+module screw_hole_m3(h) {
+    // Through screw hole
+    translate([0, 0, -0.01])
+    cylinder(h=h, d=3.2, $fn=50);
+
+    // Hex nut cutout 
+    translate([0, 0, h - 3])
+    hull() {
+        // Large hex nut
+        translate([0, 0, 3])
+        linear_extrude(0.01)
+        hexagon(inradius=2.85);
+
+        // Small hex nut
+        linear_extrude(0.01)
+        hexagon(inradius=2.65);
+    }
+
+    // Screw head cutout
+    translate([0, 0, h - 3])
+    cylinder(h=2.61, d=5.5, $fn=50);
+
+    // Bottom screw thread protrusion cutout
+    translate([0, 0, -0.01])
+    cylinder(h=1.01, d=4.4, $fn=100);
+}
+
+screw_hole_m3(h=10);

v1/scad/lib/util/torus.scad

@@ -0,0 +1,8 @@
+module torus(r_major, r_minor, xs=1.0, ys=1.0) {
+    rotate_extrude()
+    translate([r_major, 0, 0])
+    scale([xs, ys, 1.0])
+    circle(r=r_minor);
+}
+
+torus(r_major=10, r_minor=2, xs=0.5, $fn=200);