added cad files

cad/README.md

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+# CAD Files
+
+CAD files for 3D printed magnet holder. Compatible for magnets with size 20x10x5 mm and 
+*be quiet! Silent Wings 3 140 mm* fans.
+
+<p align="center">
+<img src="https://github.com/micworg/test/blob/master/images/magnetmount.jpg" width=500>
+</p>
+
+<p align="center">
+<img src="https://github.com/micworg/test/blob/master/images/magnetmount_openscad.png" width=500>
+</p>

cad/magnetmount.scad

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+$fn=128;
+
+fw = 48.3;   // fan width
+
+h  = 4;      // base height
+r  = 5;      // edge width
+
+pn = 7;      // number of pins
+ph = 7;      // pin height
+pa = 20;     // pin angle
+
+mw = 10.25;  // magnet width
+ml = 20.25;  // magnet length
+mb = 17;     // magnet bar width
+g  = 10;     // magnet gap
+
+d=fw+r+r;    // total diameter
+cl=d-r;      // magnet bar length
+a=360/pn;    // segment angle
+
+difference() {
+  union() {
+    difference() {
+      translate([0,0,0]) cylinder(h+ph,d/2,d/2);
+      translate([0,0,-1]) cylinder(h+ph+2,d/2-r,d/2-r);
+      for (i =[0:1:pn-1]) {
+        pin(a*i);
+      }
+    }
+    translate([-cl/2,-mb/2,0]) cube([cl,mb,h]);
+    rotate ([0,0,90]) translate([-cl/2,-(mb-mw)/4-d/7,0]) cube([cl,(mb-mw)/2,h]);
+    rotate ([0,0,90]) translate([-cl/2,-(mb-mw)/4+d/7,0]) cube([cl,(mb-mw)/2,h]);
+  }
+  translate([-ml-g/2,-mw/2,-1]) cube([ml,mw,h]);
+  translate([g/2,-mw/2,-1]) cube([ml,mw,h]);
+}
+
+module pin(r) {
+  translate([0,0,0.01]) rotate([0,0,r]) hull() {
+    translate([0,0,h]) cylinder(h+ph,0.1,0.1);
+    translate([-d,0,h]) cylinder(h+ph,0.1,0.1);
+    rotate ([0,0,a-pa])union() {
+      translate([0,0,h]) cylinder(h+ph,0.1,0.1);
+      translate([-d,0,h]) cylinder(h+ph,0.1,0.1);
+    }
+  }
+}