commit f65d7c226ff53951bbe0a3a1d9230e7279044767
Author: David Ashby <delta.mu.alpha@gmail.com>
Date:   Sat Jan 8 14:01:13 2022 -0500

    add recipebox

diff --git a/recipebox.scad b/recipebox.scad
new file mode 100644
index 0000000..068858c
--- /dev/null
+++ b/recipebox.scad
@@ -0,0 +1,83 @@
+inch=25.4; // treating 1 unit as 1 mm
+
+module box(size=[1, 1, 1], wall) {
+    innerWidth=size.x;
+    innerHeight=size.y;
+    innerDepth=size.z;
+    outerWidth=innerWidth+wall;
+    outerHeight=innerHeight+wall+1;
+    outerDepth=innerDepth+wall;
+
+    difference() {
+        cube([outerWidth, outerDepth, outerHeight],
+            center=true);
+        translate([0, 0, wall]) {
+            cube([innerWidth, innerDepth, innerHeight+0.001],
+                center=true);
+        }
+    }
+    // ribs
+    for (i = [ -innerDepth/2+2 : 5 : innerDepth/2 ]) {
+        translate([innerWidth/2, i, 0]) {
+            cube([2, 1, innerHeight-10], center=true);
+        }
+        translate([-innerWidth/2, i, 0]) {
+            cube([2, 1, innerHeight-10], center=true);
+        }
+        translate([0, i, -innerHeight/2+3]) {
+            cube([innerWidth-5, 1, 1], center=true);
+        }
+    }
+}
+
+module cutBox(size=[1,1,1], wall) {
+    width=size.x;
+    height=size.y;
+    depth=size.z;
+    
+    difference(){
+        // define box
+        box([width, height, depth], wall);
+
+        // slice off top
+        translate([0,-15,1.5*inch]) {
+            rotate([15,0,0]) {
+                cube([width+wall*2,height*2,depth], center=true);
+            }
+        }
+    }
+}
+
+module pattern(size=[1,1,1], squareSize, ribSize) {
+    width=size.x;
+    height=size.y;
+    depth=size.z;
+    
+    for (i = [ -width/2 : squareSize+ribSize : width/2 ]) {
+        for (j = [ -depth/2 : squareSize+ribSize : depth/2 ]) {
+            translate([i, 0, j]) {
+                cube([squareSize, height, squareSize], center=true);
+            }
+        }
+    }
+}
+
+width=5.05*inch;
+height=3*inch;
+depth=2*inch;
+wallThickness=3;
+patternMargin=0.10*inch;
+
+difference() {
+    cutBox([width, height, depth], wallThickness);
+
+    translate([0,-depth/2-.05, -inch/1.6]) {
+        intersection() {
+            cube([width-patternMargin*2-1.5, wallThickness, height-patternMargin*2-inch*1.5],
+                center=true);
+            rotate([0,45,0]) {
+                pattern([200, wallThickness+.05, 200], 10, 5);
+            }
+        }
+    }
+}
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