Added stronger magnet and made screw holes deeper

kblock_ext/kblock_ext.scad

@@ -1,18 +1,19 @@
-h=5;
+h=7;
 r0=3;
 $fn=50;
 l=60;
 w=30;
 magnet_play=0.5;
 magnet_l=19.5+magnet_play;
-magnet_w=5.8+magnet_play;
+magnet_w=5.8+magnet_play/5.0;
 magnet_h=2.7+magnet_play;
-magnet_hole_h=0.8*h;
-screw_play=0.5;
-screw_head_r=6.8/2 + screw_play;
+magnet_hole_h=0.92*h;
+screw_play=0.2;
+// Let's give one millimeter more
+screw_head_r=6.8/2 + 5*screw_play;
 screw_thread_r=3.5/2 + screw_play;
 screw_head_h=2.5 + screw_play;
-color("green", 1.0) {
+color("white", 1.0) {
   difference()
   {
     translate([r0, r0, 0])
@@ -38,8 +39,8 @@ color("green", 1.0) {
     }
     translate([l/2, 0, 0])
     union() {
-      for (x=[-1:1:1]) {
-        translate([x*2.0*magnet_w, w/2, -h/2+magnet_hole_h/2-0.001])
+      for (x=[-2:1:2]) {
+        translate([x*1.0*magnet_w-x*0.001, w/2, -h/2+magnet_hole_h/2-0.001])
         rotate([0, 0, 90])
         cube([magnet_l, magnet_w, magnet_hole_h], center=true);
       }