Add cmount extension tubes

A script for generating cmount extension tubes of arbitrary lengths

models/cmount_extension_tubes/cmount_extension_tubes.scad

@@ -0,0 +1,55 @@
+//EXTENSION TUBES
+$fn = 100;
+tube_len = 10; // [4:100]
+time = 0;
+
+//-----------------------------------------------------------------------------
+// Standard: c-mount male
+// @param: inner_d = 23mm (for 0.3mm resolution printer)
+// @paramL outer_d = 24.7mm
+//
+//-----------------------------------------------------------------------------
+module cmount_male(len) {
+	inner_d = 23;
+	outer_d = 24.7;
+	f_inner_d = 25.4;
+	f_outer_d = 28.6;
+	translate ([0, 0, len / 2 ]) {
+		difference () {
+			union () {
+				cylinder(r = outer_d / 2, h = len, center = true);
+			}
+			cylinder(r = inner_d / 2, h = len + 1, center = true);
+		}
+
+		difference () {
+			translate([0, 0, -(len / 2) - 1]) cylinder(r = f_outer_d / 2, h = 2, center = true);
+			translate([0, 0, -(len / 2) - 1]) cylinder(r1 = f_inner_d / 2, r2 = inner_d / 2, h = 2, center = true);
+		}	
+	}
+}
+
+//-----------------------------------------------------------------------------
+// Standard: c-mount female
+// @param: inner_d = 26mm(for 0.3mm resolution printer) //CHANGINE
+// @paramL outer_d = 29.2mm 
+//
+//-----------------------------------------------------------------------------
+module cmount_female(len) {
+	inner_d = 25.6;
+	outer_d = 29.2;
+	translate ([0, 0, (len / 2)]) {
+		difference () {
+			cylinder(r = outer_d / 2, h = len, center = true);
+			cylinder(r = inner_d / 2, h = len + 1, center = true);
+		}	
+	}
+
+}
+
+module extension_tube (len = 10) {
+	translate([0, 0, len]) cmount_male(4);
+	translate([0, 0, 0]) cmount_female(len);
+}
+
+rotate([0, 0, time]) extension_tube(tube_len);