Several minor improvements:

- Changed "reset button" to a small round button, while the three control
buttons keep their larger/rectangular shape. The reset button is barely
needed. The round shape avoids confusion when operating the device.
- Minor correction of the proportions of the outer shell - to match the
real Disk II more closely.

scad/components/buttons.scad

@@ -16,6 +16,22 @@ module button()
 	rotate([0,180,0]) screwPost(ButtonPegDepth, ButtonPegDiameter+2, ButtonPegDiameter, ButtonPegDepth, 1);
 }
 
+// single round/reset button
+module resetButton()
+{
+	$fn = 30;
+
+	// front part of the button
+	translate([0, 0, 0])
+		cylinder(r=(ButtonXWidth-3)/2, ButonZDepth);
+
+	// slightly larger frame around the buttons rear, to keep the button from falling through the panel
+	cylinder(r=(ButtonXWidth-3+ButtonLedgeWidth)/2, SKIN);
+
+	// connector for the button's peg
+	rotate([0,180,0]) screwPost(ButtonPegDepth, ButtonPegDiameter+2, ButtonPegDiameter, ButtonPegDepth, 1);
+}
+
 module makeCableStrainRelief()
 {
 	StrainReliefHeight=4+SKIN;

scad/components/front.scad

@@ -13,6 +13,16 @@ module buttonCutout()
 		roundedCube(buttonXWidth, buttonYHeight, SKIN, ButtonCorners);
 }
 
+// front panel hole for a round button
+module resetButtonCutout()
+{
+	// add 1mm spacing, so the button moves freely (results in 0.5mm clearance on each side)
+	buttonWidth = ButtonXWidth-3+0.5;
+
+	$fn = 20;
+	cylinder(r=buttonWidth/2, SKIN);
+}
+
 // test / unused
 module buttonFrame()
 {
@@ -56,7 +66,7 @@ module panelCutouts()
 		{
 			translate([ButtonXOfs+ButtonXWidth/2+(ButtonXSpacing)*x, 
 				   BoxY_Height-ButtonYHeight/2-ButtonYOfs-(ButtonYSpacing)*y, 0])
-				buttonCutout();
+				resetButtonCutout();
 		}
 	}
 

scad/components/main.scad

@@ -10,13 +10,13 @@ SKIN = 1.0; // [1: 0.1: 5]
 /* [Hidden] */
 
 // Width (X) of the box
-BoxX_Width = 155*ScalingFactor; // [60: 145]
+BoxX_Width = 155.5*ScalingFactor; // [60: 145]
 
 // Height (Y) of the box
-BoxY_Height = 90*ScalingFactor; // [10: 100]
+BoxY_Height = 91*ScalingFactor; // [10: 100]
 
 // Depth (Z) of the box
-BoxZ_Depth = 210*ScalingFactor; // [10: 200]
+BoxZ_Depth = 219*ScalingFactor; // [10: 200]
 
 // Width of the ventilation cut
 VentilationWidth   =  4*ScalingFactor;
@@ -146,7 +146,10 @@ module main()
 	{
 		for (x = [0,1])
 		for (y = [0,1])
+			if ((x!=0)||(y!=0))
 				translate([x*ButtonXSpacing, y*ButtonYSpacing, -ButonZDepth]) button();
+			else
+				translate([x*ButtonXSpacing, y*ButtonYSpacing, -ButonZDepth]) resetButton();
 		translate([-15, 20, 0]) rotate([0,0,90]) makeCableStrainRelief();
 		translate([30, -15, 0]) makeRearPcbFeet();
 	}

scad/disk_II.scad

@@ -18,7 +18,7 @@ LEDs = "one"; // [one:One / Activity LED,two:Both / Activity and Power LEDs]
 
 /* [Internals] */
 // Base board imprint
-IMPRINT = "MADE IN GERMANY";  // 30
+IMPRINT = "TCB 9/2023";  // 30
 
 // Distance of the components (when showing 'exploded' elements)
 SEPARATION = 30; // [0: 1: 100]