diff --git a/iButton Holder.scad b/iButton Holder.scad
new file mode 100644
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--- /dev/null
+++ b/iButton Holder.scad	
@@ -0,0 +1,28 @@
+// 12th Jan 2022
+// (c) Martin "maride" Dessauer
+// Pour Markus, mon ami
+IBUTTON_DIAMETER = 17.5;
+IBUTTON_HEIGHT = 6;
+IBUTTON_HEIGHT_FACTOR = 0.5;
+HOLDER_DIAMETER_1 = IBUTTON_DIAMETER + 5;
+HOLDER_DIAMETER_2 = HOLDER_DIAMETER_1 / 2;
+HOLDER_LENGTH = 40;
+HOLE_INNER_SIZE = 6;
+
+$fn = 36;
+
+difference() {
+    union() {
+        // Shaft
+        cylinder(h = HOLDER_LENGTH, d1 = HOLDER_DIAMETER_1, d2 = HOLDER_DIAMETER_2);
+        // Ball/Cap at the top
+        translate([0, 0, HOLDER_LENGTH])
+        sphere(d = HOLDER_DIAMETER_2);
+    }
+    // iButton hole
+    cylinder(h = IBUTTON_HEIGHT * IBUTTON_HEIGHT_FACTOR, d = IBUTTON_DIAMETER);
+    // Keychain hole
+    translate([0, HOLDER_DIAMETER_1/2, HOLDER_LENGTH])
+    rotate([90, 0, 0])
+    cylinder(h = HOLDER_DIAMETER_1, d = HOLE_INNER_SIZE);
+}
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