# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1412701996 -7200
# Node ID 7f0bd49f19127b0fe03fda9574bdf9734d23a4c1
# Parent  f6f352022ef4a88145c1ce73703fa641166748ac
Added configuration options for separating the pieces and omitting features.

diff -r f6f352022ef4 -r 7f0bd49f1912 cartridge.scad
--- a/cartridge.scad	Tue Oct 07 18:30:46 2014 +0200
+++ b/cartridge.scad	Tue Oct 07 19:13:16 2014 +0200
@@ -26,6 +26,10 @@
 	TOP_LABEL_INSET = 1;
 	GROOVE = 1;
 
+	BACK = 1; BACK_SURFACE = 1;
+	FRONT = 1; FRONT_SURFACE = 1;
+	APART = 1;
+
 	/*
 	Rounding/fillet radius and additional margin of subtracted
 	material. The additional margin helps avoid geometry problems.
@@ -359,364 +363,380 @@
 
 	/* The actual shapes. */
 
-	translate([-width * 0.6, 0, 0])
-	difference() {
+	front_displacement = APART ? -width * 0.6 : 0;
+
+	if (FRONT)
+		translate([front_displacement, 0, 0])
+		difference() {
 
-		/* The cartridge surfaces. */
+			/* The cartridge surfaces. */
 
-		union() {
+			union() {
 
-			/* Front portion. */
+				/* Front portion. */
 
-			translate([0, -front_depth + front / 2, 0])
-				cube([width, front, height], center = true);
-			translate([-width / 2 + front_left / 2, -front_depth / 2, 0])
-				cube([front_left, front_depth, height], center = true);
-			translate([width / 2 - front_right / 2, -front_depth / 2, 0])
-				cube([front_right, front_depth, height], center = true);
-			translate([0, -front_depth / 2, height / 2 - top / 2])
-				cube([width, front_depth, top], center = true);
-			difference() {
+				if (FRONT_SURFACE) {
+					cube_at(width, front, height,
+						0, -1, 0,
+						0, -int_front_depth, 0);
+					cube_at(front_left, front_depth, height,
+						-1, -1, 0,
+						-int_width / 2, 0, 0);
+					cube_at(front_right, front_depth, height,
+						1, -1, 0,
+						int_width / 2, 0, 0);
+					cube_at(width, front_depth, top,
+						0, -1, 1,
+						0, 0, int_payload_upper_extent);
+				}
 
-				/* Floor of cartridge. */
+				difference() {
+
+					/* Floor of cartridge. */
+
+					cube_at(width, front_depth, bottom,
+						0, -1, 1,
+						0, 0, -height / 2 + int_connector_height);
+
+					/* Left cutout. */
 
-				cube_at(width, front_depth, bottom,
-					0, -1, 1,
-					0, 0, -height / 2 + int_connector_height);
+					cube_at(edge_connector_cutout_front_width,
+						edge_connector_cutout_front_depth,
+						bottom,
+						1, -1, 1,
+						-width / 2 + edge_connector_cutout_front_offset,
+						0,
+						-height / 2 + int_connector_height);
+
+					/* Right cutout. */
 
-				/* Left cutout. */
+					cube_at(edge_connector_cutout_front_width,
+						edge_connector_cutout_front_depth,
+						bottom,
+						-1, -1, 1,
+						width / 2 - edge_connector_cutout_front_offset,
+						0,
+						-height / 2 + int_connector_height);
+				}
+
+				/* PCB supports. */
 
-				cube_at(edge_connector_cutout_front_width,
-					edge_connector_cutout_front_depth,
-					bottom,
-					1, -1, 1,
-					-width / 2 + edge_connector_cutout_front_offset,
-					0,
-					-height / 2 + int_connector_height);
+				cube_at(pcb_front_support_width,
+						pcb_front_support_depth,
+						pcb_front_support_height,
+						1, -1, 1,
+						-edge_connector_cutout_back_width / 2 +
+							pcb_support_margin,
+						0,
+						-height / 2 + bottom + int_connector_height);
 
-				/* Right cutout. */
+				cube_at(pcb_front_support_width,
+						pcb_front_support_depth,
+						pcb_front_support_height,
+						-1, -1, 1,
+						edge_connector_cutout_back_width / 2 -
+							pcb_support_margin,
+						0,
+						-height / 2 + bottom + int_connector_height);
 
-				cube_at(edge_connector_cutout_front_width,
-					edge_connector_cutout_front_depth,
-					bottom,
-					-1, -1, 1,
-					width / 2 - edge_connector_cutout_front_offset,
-					0,
-					-height / 2 + int_connector_height);
+				/* Circular "lugs" to hold PCBs in place. */
+
+				pcb_front_lug(-1);
+				pcb_front_lug(1);
 			}
 
-			/* PCB supports. */
+			/* Label insets. */
+
+			union() {
+
+				/* Front label. */
 
-			cube_at(pcb_front_support_width,
-					pcb_front_support_depth,
-					pcb_front_support_height,
-					1, -1, 1,
-					-edge_connector_cutout_back_width / 2 +
-						pcb_support_margin,
-					0,
-					-height / 2 + bottom + int_connector_height);
-
-			cube_at(pcb_front_support_width,
-					pcb_front_support_depth,
-					pcb_front_support_height,
-					-1, -1, 1,
-					edge_connector_cutout_back_width / 2 -
-						pcb_support_margin,
-					0,
-					-height / 2 + bottom + int_connector_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]);
 
-			/* Circular "lugs" to hold PCBs in place. */
-
-			pcb_front_lug(-1);
-			pcb_front_lug(1);
-		}
-
-		/* Label insets. */
-
-		union() {
+				/* Top label. See also the back piece. */
 
-			/* Front label. */
+				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]);
+			}
 
-			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. See also the back piece. */
+			/* Inner front edge cavity. */
 
-			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. */
+			translate([inner_front_edge_width / 2, -int_front_depth, -height / 2])
+				rotate([0, -90, 0])
+					linear_extrude(height = inner_front_edge_width)
+						polygon([
+							[-extra, -inner_front_edge_depth],
+							[0, -inner_front_edge_depth],
+							[inner_front_edge_height, 0],
+							[-extra, 0],
+							]);
 
-		translate([inner_front_edge_width / 2, -int_front_depth, -height / 2])
-			rotate([0, -90, 0])
-				linear_extrude(height = inner_front_edge_width)
-					polygon([
-						[-extra, -inner_front_edge_depth],
-						[0, -inner_front_edge_depth],
-						[inner_front_edge_height, 0],
-						[-extra, 0],
-						]);
+			/* Inner top cutout for the top and sides of the back portion. */
 
-		/* Inner top cutout for the top and sides of the back portion. */
+			cube_at(inner_top_front_cutout_width,
+				inner_top_front_cutout_depth,
+				inner_top_front_cutout_height,
+				0, -1, 1,
+				0, 0, int_payload_upper_extent);
 
-		cube_at(inner_top_front_cutout_width,
-			inner_top_front_cutout_depth,
-			inner_top_front_cutout_height,
-			0, -1, 1,
-			0, 0, int_payload_upper_extent);
+			cube_at(inner_side_front_cutout_width,
+				inner_side_front_cutout_depth,
+				inner_side_front_cutout_height,
+				1, -1, 0,
+				int_width / 2, 0, -inner_top_front_cutout_height);
 
-		cube_at(inner_side_front_cutout_width,
-			inner_side_front_cutout_depth,
-			inner_side_front_cutout_height,
-			1, -1, 0,
-			int_width / 2, 0, -inner_top_front_cutout_height);
+			cube_at(inner_side_front_cutout_width,
+				inner_side_front_cutout_depth,
+				inner_side_front_cutout_height,
+				-1, -1, 0,
+				-int_width / 2, 0, -inner_top_front_cutout_height);
 
-		cube_at(inner_side_front_cutout_width,
-			inner_side_front_cutout_depth,
-			inner_side_front_cutout_height,
-			-1, -1, 0,
-			-int_width / 2, 0, -inner_top_front_cutout_height);
+			/* Fillets to round off the edges. */
+
+			union() {
 
-		/* Fillets to round off the edges. */
-
-		union() {
-
-			/* Top left and right rounding. */
-		
-			translate([-width / 2 + ro, -front_depth / 2, height / 2 - ro])
-				rotate([0, 0, 180])
+				/* Top left and right rounding. */
+			
+				translate([-width / 2 + ro, -front_depth / 2, height / 2 - ro])
+					rotate([0, 0, 180])
+						rotate([90, 0, 0])
+							fillet(rr, front_depth);
+				translate([width / 2 - ro, -front_depth / 2, height / 2 - ro])
 					rotate([90, 0, 0])
 						fillet(rr, front_depth);
-			translate([width / 2 - ro, -front_depth / 2, height / 2 - ro])
-				rotate([90, 0, 0])
-					fillet(rr, front_depth);
 
-			/* Top front rounding. */
-		
-			translate([0, -front_depth + ro, height / 2 - ro])
-				rotate([0, 0, 180])
-					rotate([0, -90, 0])
-						fillet(rr, width);
+				/* Top front rounding. */
+			
+				translate([0, -front_depth + ro, height / 2 - ro])
+					rotate([0, 0, 180])
+						rotate([0, -90, 0])
+							fillet(rr, width);
 
-			/* Edge rounding. */
-		
-			translate([-width / 2 + ro, -front_depth + ro, 0])
-				rotate([0, 0, 180])
-					fillet(rr, height);
-			translate([width / 2 - ro, -front_depth + ro, 0])
-				rotate([0, 0, 270])
-					fillet(rr, height);
+				/* Edge rounding. */
+			
+				translate([-width / 2 + ro, -front_depth + ro, 0])
+					rotate([0, 0, 180])
+						fillet(rr, height);
+				translate([width / 2 - ro, -front_depth + ro, 0])
+					rotate([0, 0, 270])
+						fillet(rr, height);
+			}
 		}
-	}
 
 	/*
 	Place the back piece next to the front, with the internals facing out
-	the same way.
+	the same way, if APART is defined.
 	*/
 
-	translate([width * 0.6, 0, 0])
-	rotate([0, 0, 180])
-	difference() {
+	back_displacement = APART ? width * 0.6 : 0;
+	back_rotation = APART ? 180 : 0;
+
+	if (BACK)
+		translate([back_displacement, 0, 0])
+		rotate([0, 0, back_rotation])
+		difference() {
+
+			/* The cartridge surfaces. */
+
+			union() {
+
+				/* Back portion. */
 
-		/* The cartridge surfaces. */
+				if (BACK_SURFACE) {
+					cube_at(width, back, height,
+						0, 1, 0,
+						0, int_back_depth, 0);
+					cube_at(back_left, back_depth + groove_width_extra, height,
+						-1, 1, 0,
+						-int_width / 2, -groove_width_extra, 0);
+					cube_at(back_right, back_depth + groove_width_extra, height,
+						1, 1, 0,
+						int_width / 2, -groove_width_extra, 0);
+					cube_at(width, back_depth + groove_width_extra, top,
+						0, 1, 1,
+						0, -groove_width_extra, int_payload_upper_extent);
+				}
 
-		union() {
+				difference() {
 
-			/* Back portion. */
+					/* Floor of cartridge. */
 
-			cube_at(width, back, height,
-				0, 1, 0,
-				0, int_back_depth, 0);
-			cube_at(back_left, back_depth + groove_width_extra, height,
-				-1, 1, 0,
-				-int_width / 2, -groove_width_extra, 0);
-			cube_at(back_right, back_depth + groove_width_extra, height,
-				1, 1, 0,
-				int_width / 2, -groove_width_extra, 0);
-			cube_at(width, back_depth + groove_width_extra, top,
-				0, 1, 1,
-				0, -groove_width_extra, int_payload_upper_extent);
+					cube_at(width, back_depth, bottom,
+						0, 1, 1,
+						0, 0, -height / 2 + int_connector_height);
+
+					/* Edge connector cutout. */
+
+					cube_at(edge_connector_cutout_back_width,
+						edge_connector_cutout_back_depth,
+						bottom,
+						0, 1, 1,
+						0, 0, -height / 2 + int_connector_height);
+				}
+
+				/* PCB supports. */
 
-			difference() {
-
-				/* Floor of cartridge. */
+				pcb_support(-1, pcb_back_support_left_bump_height,
+					pcb_back_support_left_bump_offset_from_bottom);
+				pcb_support(1, pcb_back_support_right_bump_height,
+					pcb_back_support_right_bump_offset_from_bottom);
 
-				cube_at(width, back_depth, bottom,
-					0, 1, 1,
-					0, 0, -height / 2 + int_connector_height);
+				/* Circular "lugs" to hold PCBs in place. */
+
+				pcb_lug(-1);
+				pcb_lug(1);
+			}
 
-				/* Edge connector cutout. */
+			/* Label insets. */
+
+			union() {
+
+				/* Top label. See also the front piece. */
 
-				cube_at(edge_connector_cutout_back_width,
-					edge_connector_cutout_back_depth,
-					bottom,
-					0, 1, 1,
-					0, 0, -height / 2 + int_connector_height);
+				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]);
 			}
 
-			/* PCB supports. */
-
-			pcb_support(-1, pcb_back_support_left_bump_height,
-				pcb_back_support_left_bump_offset_from_bottom);
-			pcb_support(1, pcb_back_support_right_bump_height,
-				pcb_back_support_right_bump_offset_from_bottom);
-
-			/* Circular "lugs" to hold PCBs in place. */
+			/* Top and side grooves, positioned in the back portion. */
 
-			pcb_lug(-1);
-			pcb_lug(1);
-		}
+			union() {
 
-		/* Label insets. */
-
-		union() {
-
-			/* Top label. See also the front piece. */
+				/* Left groove. */
 
-			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. */
-
-		union() {
+				cube_at(groove_depth, groove_width, height,
+					1, 1, 0,
+					-width / 2, -groove_width_extra, 0);
 
-			/* Left groove. */
-
-			cube_at(groove_depth, groove_width, height,
-				1, 1, 0,
-				-width / 2, -groove_width_extra, 0);
-
-			/* Right groove. */
-
-			cube_at(groove_depth, groove_width, height,
-				-1, 1, 0,
-				width / 2, -groove_width_extra, 0);
+				/* Right groove. */
 
-			/* Top grooves. */
-
-			cube_at(width, groove_width, groove_depth,
-				0, 1, -1,
-				0, -groove_width_extra, height / 2);
+				cube_at(groove_depth, groove_width, height,
+					-1, 1, 0,
+					width / 2, -groove_width_extra, 0);
 
-			cube_at(width, top_groove_width, top_groove_depth,
-				0, 1, -1,
-				0, -groove_width_extra, height / 2);
-		}
-
-		/* Back cavity. */
-
-		if (BACK_CAVITY)
-			intersection() {
-
-				/* From the bottom upwards. */
+				/* Top grooves. */
 
-				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]
-								]);
+				cube_at(width, groove_width, groove_depth,
+					0, 1, -1,
+					0, -groove_width_extra, height / 2);
 
-				/* 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]
-								]);
+				cube_at(width, top_groove_width, top_groove_depth,
+					0, 1, -1,
+					0, -groove_width_extra, height / 2);
 			}
 
-		/* Inner back cavities. */
+			/* Back cavity. */
+
+			if (BACK_CAVITY)
+				intersection() {
+
+					/* From the bottom upwards. */
 
-		translate([0, int_back_depth, -height / 2])
-			linear_extrude(height = int_connector_height)
-				translate([-int_width / 2, 0, 0])
-					polygon([
-						[0, 0],
-						[inner_back_slope_max_offset, 0],
-						[inner_back_slope_min_offset,
-							inner_back_slope_depth],
-						[0, inner_back_slope_depth]
-						]);
+					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. */
+
+					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. */
 
-		translate([0, int_back_depth, -height / 2])
-			linear_extrude(height = int_connector_height)
-				translate([int_width / 2, 0, 0])
-					polygon([
-						[0, 0],
-						[-inner_back_slope_max_offset, 0],
-						[-inner_back_slope_min_offset,
-							inner_back_slope_depth],
-						[0, inner_back_slope_depth]
-						]);
+			translate([0, int_back_depth, -height / 2])
+				linear_extrude(height = int_connector_height)
+					translate([-int_width / 2, 0, 0])
+						polygon([
+							[0, 0],
+							[inner_back_slope_max_offset, 0],
+							[inner_back_slope_min_offset,
+								inner_back_slope_depth],
+							[0, inner_back_slope_depth]
+							]);
 
-		/* Inner back edge cavity. */
+			translate([0, int_back_depth, -height / 2])
+				linear_extrude(height = int_connector_height)
+					translate([int_width / 2, 0, 0])
+						polygon([
+							[0, 0],
+							[-inner_back_slope_max_offset, 0],
+							[-inner_back_slope_min_offset,
+								inner_back_slope_depth],
+							[0, inner_back_slope_depth]
+							]);
 
-		translate([inner_back_edge_width / 2,
-			int_back_depth + inner_back_edge_depth, -height / 2])
-			rotate([0, -90, 0])
-				linear_extrude(height = inner_back_edge_width)
-					polygon([
-						[-extra, -inner_back_edge_depth],
-						[inner_back_edge_height, -inner_back_edge_depth],
-						[0, 0],
-						[-extra, 0]
-						]);
+			/* Inner back edge cavity. */
 
-		/* Fillets to round off the edges. */
-
-		union() {
+			translate([inner_back_edge_width / 2,
+				int_back_depth + inner_back_edge_depth, -height / 2])
+				rotate([0, -90, 0])
+					linear_extrude(height = inner_back_edge_width)
+						polygon([
+							[-extra, -inner_back_edge_depth],
+							[inner_back_edge_height, -inner_back_edge_depth],
+							[0, 0],
+							[-extra, 0]
+							]);
 
-			/* Top left and right rounding. */
-		
-			translate([-width / 2 + ro, back_depth / 2, height / 2 - ro])
-				rotate([0, 0, 180])
+			/* Fillets to round off the edges. */
+
+			union() {
+
+				/* Top left and right rounding. */
+			
+				translate([-width / 2 + ro, back_depth / 2, height / 2 - ro])
+					rotate([0, 0, 180])
+						rotate([90, 0, 0])
+							fillet(rr, back_depth);
+				translate([width / 2 - ro, back_depth / 2, height / 2 - ro])
 					rotate([90, 0, 0])
 						fillet(rr, back_depth);
-			translate([width / 2 - ro, back_depth / 2, height / 2 - ro])
-				rotate([90, 0, 0])
-					fillet(rr, back_depth);
-		
-			/* Top back rounding. */
-		
-			translate([0, back_depth - ro, height / 2 - ro])
-				rotate([0, -90, 0])
-					fillet(rr, width);
-		
-			/* Edge rounding. */
-		
-			translate([width / 2 - ro, back_depth - ro, 0])
-				fillet(rr, height);
-			translate([-width / 2 + ro, back_depth - ro, 0])
-				rotate([0, 0, 90])
+			
+				/* Top back rounding. */
+			
+				translate([0, back_depth - ro, height / 2 - ro])
+					rotate([0, -90, 0])
+						fillet(rr, width);
+			
+				/* Edge rounding. */
+			
+				translate([width / 2 - ro, back_depth - ro, 0])
 					fillet(rr, height);
+				translate([-width / 2 + ro, back_depth - ro, 0])
+					rotate([0, 0, 90])
+						fillet(rr, height);
+			}
 		}
-	}
 }
 
 cartridge();