# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1389397950 -3600
# Node ID 830b2306de4718d36bd6e043a9e11b9d504ac96c
# Parent  6d6a89d6dddc427e23f57ec5e01cbd73a330242e
Added grooves in the outer surface of the cartridge, although in reality the
grooves are an artefact of the connection between the two separate halves of the
cartridge casing.

diff -r 6d6a89d6dddc -r 830b2306de47 cartridge.scad
--- a/cartridge.scad	Sat Jan 11 00:43:42 2014 +0100
+++ b/cartridge.scad	Sat Jan 11 00:52:30 2014 +0100
@@ -26,6 +26,7 @@
 	top_label_height = 11.5;
 	top_label_depth = front_label_depth;
 	top_label_offset_from_front = 2.5;
+	groove_depth = 1.0;
 
 	/* Side thicknesses. */
 
@@ -80,6 +81,26 @@
 					top_label_depth]);
 		}
 
+		/* Top and side grooves. */
+
+		union() {
+
+			/* Left groove. */
+
+			translate([-width / 2 + groove_depth / 2, 0, 0])
+				cube([groove_depth, groove_depth, height], center = true);
+
+			/* Right groove. */
+
+			translate([width / 2 - groove_depth / 2, 0, 0])
+				cube([groove_depth, groove_depth, height], center = true);
+
+			/* Top groove. */
+
+			translate([0, 0, height / 2 - groove_depth / 2])
+				cube([width, groove_depth, groove_depth], center = true);
+		}
+
 		/* Fillets to round off the edges. */
 
 		union() {