# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1412688020 -7200
# Node ID bd66a16190dbc4c8df96b8849d41f568007af89f
# Parent  cf96720ec877ff66ced2e2cc999b93e13cb1c95d
Permitted the configuration of various features.

diff -r cf96720ec877 -r bd66a16190db cartridge.scad
--- a/cartridge.scad	Tue Oct 07 00:39:32 2014 +0200
+++ b/cartridge.scad	Tue Oct 07 15:20:20 2014 +0200
@@ -19,6 +19,13 @@
 {
 	$fn = 50;
 
+	/* Configure the generated shapes. */
+
+	BACK_CAVITY = 1;
+	FRONT_LABEL_INSET = 1;
+	TOP_LABEL_INSET = 1;
+	GROOVE = 1;
+
 	/*
 	Rounding/fillet radius and additional margin of subtracted
 	material. The additional margin helps avoid geometry problems.
@@ -120,9 +127,13 @@
 	top_label_depth = front_label_depth;
 	top_label_offset_from_front = 2.5;
 
-	/* The groove around the sides and top. */
+	/*
+	The groove around the sides and top. This is extended to allow the
+	pieces to fit together, and this extension is generated regardless of
+	whether the visible groove is enabled or not.
+	*/
 
-	groove_width_exposed = 1.5;
+	groove_width_exposed = GROOVE ? 1.5 : 0;
 	groove_width = groove_width_exposed + groove_width_extra;
 	groove_depth = 1.0; /* how deep the groove goes into each side */
 
@@ -425,18 +436,20 @@
 
 			/* Front label. */
 
-			translate([-front_label_width / 2, -front_depth,
-				front_label_offset_from_bottom - height / 2])
-				cube([front_label_width, front_label_depth,
-					front_label_height]);
+			if (FRONT_LABEL_INSET)
+				translate([-front_label_width / 2, -front_depth,
+					front_label_offset_from_bottom - height / 2])
+					cube([front_label_width, front_label_depth,
+						front_label_height]);
 
-			/* Top label. */
+			/* Top label. See also the back piece. */
 
-			translate([-top_label_width / 2,
-				-front_depth + top_label_offset_from_front,
-				height / 2 - top_label_depth])
-				cube([top_label_width, top_label_height,
-					top_label_depth]);
+			if (TOP_LABEL_INSET)
+				translate([-top_label_width / 2,
+					-front_depth + top_label_offset_from_front,
+					height / 2 - top_label_depth])
+					cube([top_label_width, top_label_height,
+						top_label_depth]);
 		}
 
 		/* Inner front edge cavity. */
@@ -508,6 +521,11 @@
 		}
 	}
 
+	/*
+	Place the back piece next to the front, with the internals facing out
+	the same way.
+	*/
+
 	translate([width * 0.6, 0, 0])
 	rotate([0, 0, 180])
 	difference() {
@@ -560,13 +578,14 @@
 
 		union() {
 
-			/* Top label. */
+			/* Top label. See also the front piece. */
 
-			translate([-top_label_width / 2,
-				-front_depth + top_label_offset_from_front,
-				height / 2 - top_label_depth])
-				cube([top_label_width, top_label_height,
-					top_label_depth]);
+			if (TOP_LABEL_INSET)
+				translate([-top_label_width / 2,
+					-front_depth + top_label_offset_from_front,
+					height / 2 - top_label_depth])
+					cube([top_label_width, top_label_height,
+						top_label_depth]);
 		}
 
 		/* Top and side grooves, positioned in the back portion. */
@@ -599,37 +618,38 @@
 
 		/* Back cavity. */
 
-		intersection() {
+		if (BACK_CAVITY)
+			intersection() {
 
-			/* From the bottom upwards. */
+				/* From the bottom upwards. */
 
-			translate([0, back_depth, -height / 2])
-				linear_extrude(height = back_cavity_height)
-					translate([-int_width / 2, 0, 0])
-						polygon([
-							[back_cavity_offset_from_inner_left, 0],
-							[back_cavity_inner_offset_from_inner_left,
-								-back_cavity_depth],
-							[back_cavity_inner_offset_from_inner_left +
-								back_cavity_inner_width,
-								-back_cavity_depth],
-							[back_cavity_offset_from_inner_left +
-								back_cavity_width, 0]
-							]);
+				translate([0, back_depth, -height / 2])
+					linear_extrude(height = back_cavity_height)
+						translate([-int_width / 2, 0, 0])
+							polygon([
+								[back_cavity_offset_from_inner_left, 0],
+								[back_cavity_inner_offset_from_inner_left,
+									-back_cavity_depth],
+								[back_cavity_inner_offset_from_inner_left +
+									back_cavity_inner_width,
+									-back_cavity_depth],
+								[back_cavity_offset_from_inner_left +
+									back_cavity_width, 0]
+								]);
 
-			/* From left to right. */
+				/* From left to right. */
 
-			translate([back_cavity_width / 2, back_depth, -height / 2])
-				rotate([0, -90, 0])
-					linear_extrude(height = back_cavity_width)
-						polygon([
-							[-extra, -back_cavity_depth],
-							[back_cavity_inner_height,
-								-back_cavity_depth],
-							[back_cavity_height, 0],
-							[-extra, 0]
-							]);
-		}
+				translate([back_cavity_width / 2, back_depth, -height / 2])
+					rotate([0, -90, 0])
+						linear_extrude(height = back_cavity_width)
+							polygon([
+								[-extra, -back_cavity_depth],
+								[back_cavity_inner_height,
+									-back_cavity_depth],
+								[back_cavity_height, 0],
+								[-extra, 0]
+								]);
+			}
 
 		/* Inner back cavities. */