Added refined_hole function into block_base allowing to select option 4 - Refined holes

gridfinity-rebuilt-bins.scad

@@ -60,7 +60,7 @@ scoop = 1; //[0:0.1:1]
 only_corners = false;
 
 /* [Base] */
-style_hole = 3; // [0:no holes, 1:magnet holes only, 2: magnet and screw holes - no printable slit, 3: magnet and screw holes - printable slit]
+style_hole = 4; // [0:no holes, 1:magnet holes only, 2: magnet and screw holes - no printable slit, 3: magnet and screw holes - printable slit, 4: Gridfinity Refined hole - no glue needed]
 // number of divisions per 1 unit of base along the X axis. (default 1, only use integers. 0 means automatically guess the right division)
 div_base_x = 0;
 // number of divisions per 1 unit of base along the Y axis. (default 1, only use integers. 0 means automatically guess the right division)

gridfinity-rebuilt-utility.scad

@@ -119,6 +119,10 @@ module block_base(gx, gy, l, dbnx, dbny, style_hole, off) {
         
         if (style_hole > 0)
             pattern_circular(abs(l-d_hole_from_side/2)<0.001?1:4)
+            if (style_hole == 4)
+                translate([l/2-d_hole_from_side, l/2-d_hole_from_side, h_slit*2])
+                refined_hole();
+            else
                 translate([l/2-d_hole_from_side, l/2-d_hole_from_side, 0])
                 block_base_hole(style_hole, off);
         }
@@ -161,6 +165,39 @@ module block_base_hole(style_hole, o=0) {
     }
 }
 
+
+module refined_hole() {
+    /**
+    * Refined hole based on Printables @grizzie17's Gridfinity Refined
+    * https://www.printables.com/model/413761-gridfinity-refined
+    */
+
+    // Meassured magnet hole diameter to be 5.86mm (meassured in fusion360
+    r = r_hole2-0.32;
+
+    // Magnet height
+    m = 2;
+    mh = m-0.1;
+
+    // Poke through - For removing a magnet using a toothpick
+    ptl = h_slit*3; // Poke Through Layers
+    pth = mh+ptl; // Poke Through Height
+    ptr = 2.5; // Poke Through Radius
+
+    union() {
+        hull() {
+            // Magnet hole - smaller than the magnet to keep it squeezed
+            translate([10, -r, 0]) cube([1, r*2, mh]);
+            cylinder(1.9, r=r);
+        }
+        hull() {
+            // Poke hole
+            translate([-9+5.60, -ptr/2, -ptl]) cube([1, ptr, pth]);
+            translate([-12.53+5.60, 0, -ptl]) cylinder(pth, d=ptr);
+        }
+    }
+}
+
 module profile_wall_sub_sub() {
     polygon([
         [0,0],