# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1402096250 -7200
# Node ID 3736e22a916ba1a1be7c0f266032705a43bee58b
# Parent  e0f8c29b2b2f12a1326da4b73ce3fb404ff08c2f
Fixed the positioning of the PCB support.

diff -r e0f8c29b2b2f -r 3736e22a916b cartridge.scad
--- a/cartridge.scad	Sun May 18 14:33:10 2014 +0200
+++ b/cartridge.scad	Sat Jun 07 01:10:50 2014 +0200
@@ -131,6 +131,11 @@
 	inner_side_front_cutout_depth = groove_width_extra;
 	inner_side_front_cutout_offset = groove_depth;
 
+	/*
+	The back cavity is the indented part at the bottom of the back of the
+	cartridge.
+	*/
+
 	back_cavity_width = 68.0;
 	back_cavity_inner_width = 65.0;
 	back_cavity_offset_from_left = 10.5;
@@ -139,6 +144,8 @@
 	back_cavity_inner_height = 12.0;
 	back_cavity_depth = 1.5;
 
+	/* The effect of the cavity on the inside of the case. */
+
 	inner_back_cavity_offset = 1.0;
 	inner_back_cavity_offset_from_left = back_left;
 	inner_back_slope_offset_from_left = 10.0;
@@ -155,6 +162,8 @@
 	inner_front_edge_height = 3.0;
 	inner_front_edge_depth = 1.5;
 
+	/* The height of the floor of the compartment above the very bottom. */
+
 	bottom_from_base = 14.0;
 
 	edge_connector_cutout_front_offset = 1.0;
@@ -194,7 +203,7 @@
 	pcb_back_support_top_bump_height = 3.8;
 
 	/* Move the PCB support towards the centre. */
-	pcb_support_margin = 0.55;
+	pcb_support_margin = 1.75;
 
 	pcb_lug_depth = pcb_back_support_depth +
 		pcb_back_support_bump_depth;
@@ -218,6 +227,14 @@
 	/* Repeated constructs. */
 
 	module pcb_support(xdir, bump_height, bump_offset) {
+
+		/*
+		Translate the support in the stated direction.
+		Since the support is already justified in the direction, the translation
+		moves the inner edge of the support to alignment with the end of the
+		edge connector cutout and then back by the PCB support margin.
+		*/
+
 		translate([xdir *
 			(edge_connector_cutout_back_width / 2 - pcb_support_margin),
 			edge_connector_cutout_back_depth,