Added simple Gridfinity generator and examples.

examples/Gridfinity/scad/lathe_tool_stand.scad

@@ -0,0 +1,45 @@
+include <NopSCADlib/core.scad>
+
+use <NopSCADlib/printed/gridfinity.scad>
+use <NopSCADlib/utils/chamfer.scad>
+
+tool_size = 8;
+
+rows = 2;
+cols = 5;
+spacing = 8;
+
+hole = tool_size + 0.2;
+
+tool_pitch = hole + spacing;
+
+box = gridfinity_bin("lathe_tool_stand", 2, 1, 5);
+
+module holes()
+    for(x = [0 : cols - 1], y = [0 : rows - 1])
+        translate([x - (cols -1) / 2, y - (rows - 1) / 2] * tool_pitch)
+            children();
+
+box_mm = gridfinity_bin_size_mm(box);
+wall = 1.75;
+bwall = 1;
+
+module lathe_tool_stand_stl()
+    gridfinity_bin(box) union() {
+        translate_z(box_mm.z)
+            holes() {
+                cube([hole, hole, 2 * (box_mm.z - gridfinity_base_z() - bwall)], true);
+
+                chamfer = 1;
+                chamfer_hole(chamfer)
+                    square([hole, hole], true);
+            }
+
+        translate_z(gridfinity_base_z() + bwall)
+            difference() {
+                rounded_rectangle([box_mm.x - 2 * wall, box_mm.y - 2 * wall, box_mm.z - gridfinity_base_z() - bwall - wall], gridfinity_corner_r() - wall);
+
+                holes()
+                    rounded_rectangle([hole + 2 * wall, hole + 2 * wall, 100], wall, center = true);
+            }
+    }