Merge branch 'stage4upstream' of https://github.com/allTexas/NopSCADlib into allTexas-stage4upstream

tests/nuts.scad

@@ -85,6 +85,13 @@ module nuts() {
             if(n == M8_nut)
                nut_square(M8nS_thin_nut);
        }
+
+       translate([0,150]){
+            if(n==M4_nut)
+                weld_nut(M4_weld_nut);
+            if(n==M6_nut)
+                weld_nut(M6_weld_nut);
+       } 
     }
 }
 

tests/rod_ends.scad

@@ -0,0 +1,17 @@
+
+include <../utils/core/core.scad>
+use <../utils/layout.scad>
+
+include <../vitamins/rod_ends.scad>
+
+
+module do_rod_ends(list) {
+    diameters = [for(b = list) rod_end_bearing_od(b)];
+    max = max(diameters);
+    layout(diameters) let(b = list[$i])
+        //translate([0, (max - bb_diameter(b)) / 2])
+            rod_end_bearing(list[$i]);
+}
+
+if($preview)
+    do_rod_ends(rod_ends);