Final adjustments to mechanical bits before printing starts

mechanical/stock_parts.scad

@@ -8,6 +8,10 @@ bushing_len = 24;
 
 nema17_face = 42.3;
 
+m3_insert_d = 4.2;
+m5_insert_d = 7.5;
+m6_insert_d = 8.2;
+
 module colorize(colorname) {
   if (use_colors) {
     color(colorname) union() { children(); }