From fcd2f5308cd60d576afdc4105d8a461faa97ab7e Mon Sep 17 00:00:00 2001
From: Joel Ebel <jbebel@google.com>
Date: Wed, 23 May 2018 23:42:36 -0400
Subject: [PATCH] Support experimental snap tabs

Set SnapTabs to 1 and get tabs with buttons and semispherical holes in
the box. This is experimental because I haven't built a box like this
and don't know how well it will work. The thickness of the tab is
probably important since you need it to flex just the right amount to
allow the button to fit. Also, the ScrewHole value is used for the size
of the button, so it should not exceed 2*Thick.
---
 files/U_Box_V104_Test_Cleaned.scad | 69 +++++++++++++++++++++---------
 1 file changed, 49 insertions(+), 20 deletions(-)

diff --git a/files/U_Box_V104_Test_Cleaned.scad b/files/U_Box_V104_Test_Cleaned.scad
index 34565f4..66595e9 100644
--- a/files/U_Box_V104_Test_Cleaned.scad
+++ b/files/U_Box_V104_Test_Cleaned.scad
@@ -53,7 +53,7 @@ Vent_width = 1.5;
 
 
 /* [Box Fixation Tabs] */
-// - Side screw hole diameter
+// - Side screw hole (or snap) diameter
 ScrewHole = 2.2606;
 // Thickness of fixation tabs
 TabThick = 2;
@@ -65,6 +65,8 @@ BRTab = 1; // [0:Bottom, 1:Top]
 FLTab = 1; // [0:Bottom, 1:Top]
 // Front right tab
 FRTab = 1; // [0:Bottom, 1:Top]
+// EXPERIMENTAL: Snap tabs
+SnapTabs = 0; // [0:Screws, 1:Snaps]
 
 
 /* [PCB options] */
@@ -88,7 +90,6 @@ RightEdgeMargin = 95;
 TopPCBMargin = 84;
 
 
-
 /* [PCB_Feet] */
 // - Heuteur pied - Feet height above box interior
 FootHeight = 8;
@@ -287,7 +288,7 @@ module Coque() { //Coque - Shell
 
 /*  tab: tab module
 
-    Produces a single box fixation tab with screw hole.
+    Produces a single box fixation tab with screw hole or snap button
 */
 module tab() {
     translate([0, Thick, Height/2]) {
@@ -296,8 +297,10 @@ module tab() {
                 linear_extrude(TabThick) {
                     difference() {
                         circle(r=4*ScrewHole, $fn=6);
-                        translate([0, ScrewHole*2, 0]) {
-                            circle(d=ScrewHole, $fn=100);
+                        if (!SnapTabs) {
+                            translate([0, ScrewHole*2, 0]) {
+                                circle(d=ScrewHole, $fn=100);
+                            }
                         }
                     }
                 }
@@ -310,6 +313,16 @@ module tab() {
                     cube([8*ScrewHole,4*ScrewHole,OuterMargin*2]);
                 }
             }
+            if (SnapTabs) {
+                translate([0, ScrewHole*2, OuterMargin]) {
+                    difference() {
+                        sphere(d=ScrewHole, $fn=100);
+                        translate([0, 0, ScrewHole*.75]) {
+                            cube(ScrewHole, center=true);
+                        }
+                    }
+                }
+            }
         }
     }
 }
@@ -353,6 +366,27 @@ module Tabs(top=0) {
 }
 
 
+/*  hole: hole module
+
+    Produces a box hole for fixation. This is either a cylinder for a screw
+    or a semispherical indention for snap tabs.
+*/
+module hole() {
+    if (SnapTabs) {
+        translate([0, -Thick, Height/2 - 2*ScrewHole]) {
+            sphere(d=ScrewHole, $fn=100);
+        }
+    }
+    else {
+        translate([0, Thick, Height/2 - 2*ScrewHole]) {
+            rotate([90, 0, 0]) {
+                cylinder(Thick*3, d=ScrewHole, $fn=100);
+            }
+        }
+    }
+}
+
+
 /*  Holes: holes module
 
     This module produces the holes necessary in the box fixation tabs and in the wall
@@ -364,32 +398,27 @@ module Tabs(top=0) {
 */
 module Holes(top=0) {
     color(Couleur1) {
-        $fn = 100;
         if (BRTab != top) {
-            translate([MountInset, Width + Thick, Height/2 - 2*ScrewHole]) {
-                rotate([90, 0, 0]) {
-                    cylinder(Thick*3, d=ScrewHole);
-                }
+            translate([MountInset, Width, 0]) {
+                hole();
             }
         }
         if (FRTab!= top) {
-            translate([Length - MountInset, Width + Thick, Height/2 - 2*ScrewHole]) {
-                rotate([90, 0, 0]) {
-                    cylinder(Thick*3, d=ScrewHole);
-                }
+            translate([Length - MountInset, Width, 0]) {
+                hole();
             }
         }
         if (BLTab!= top) {
-            translate([MountInset, -Thick, Height/2 - 2*ScrewHole]) {
-                rotate([270, 0, 0]) {
-                    cylinder(Thick*3, d=ScrewHole);
+            translate([MountInset, 0, 0]) {
+                rotate([0, 0, 180]) {
+                    hole();
                 }
             }
         }
         if (FLTab != top) {
-            translate([Length - MountInset, -Thick, Height/2 - 2*ScrewHole]) {
-                rotate([270, 0, 0]) {
-                    cylinder(Thick*3, d=ScrewHole);
+            translate([Length - MountInset, 0, 0]) {
+                rotate([0, 0, 180]) {
+                    hole();
                 }
             }
         }