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diff --git a/keyBakLifter.scad b/keyBakLifter.scad
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+// This KeyBak lifter works with
+// It is designed to rest on the top of a Kossel-style Delta printer.
+// It assumes that the top of the printer is made from 20x20mm aluminum
+// extrusion.
+// An M5x8 button socket head screw holds each side of the holder in place,
+// and an M3x10 to M3x20 SHCS attaches the crossbar to it.
+//
+// This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
+// International License.
+// Visit:  http://creativecommons.org/licenses/by-sa/4.0/
+//
+// Haydn Huntley
+// haydn.huntley@gmail.com
+
+$fn = 360/4;
+
+include <configuration.scad>;
+
+// All measurements in mm.
+debug       = false;
+xSize       = extrusionWidth;
+ySize       = extrusionWidth * 1.5;
+topDiameter = 13;
+height      = 46;
+baseHeight  = 3.0;
+keyWidth    = 6.5;
+keyDepth    = 2.4;
+keyLength   = 0.25 * ySize;
+
+
+module keyBakLifter()
+{
+	difference()
+	{
+		union()
+		{
+			hull()
+			{
+				// The circular top.
+				translate([0, 0, height-smidge])
+				cylinder(d=topDiameter, h=smidge);
+		
+				// The rectangular base.
+				translate([-xSize/2, -ySize/2, 0])
+				cube([xSize, ySize, smidge]);
+			}
+			
+			// Add two trapezoids as keys on the bottom.
+			color("blue")
+			for (y = [1, -1])
+			translate([0, y*ySize*0.30, 0])
+			{
+				size = keyWidth * cos(45);
+				intersection()
+				{
+					rotate([0, 45, 0])
+					cube([size, keyLength, size], true);
+
+					cube([keyWidth, keyLength, keyDepth], true);
+				}
+			}
+		}
+
+		// Tapering hole for an M3x10 to M3x20 screw to attach the crossbar
+		// supporting the KeyBak.
+		translate([0, 0, height-20-smidge/2])
+		cylinder(r1=m3Radius-4*smidge, r2=m3TightRadius+2*smidge, h=20+smidge);
+
+		// Hole for M5x8 button head screw to attach it to the top of the
+		// frame.
+		translate([0, 0, -smidge/2])
+		cylinder(r=m5LooseRadius, h=baseHeight+smidge);
+
+		// Angled hole for accessing and inserting the M5x8.
+		hull()
+		{
+			translate([16, 0, 46])
+			scale([1.2, 1, 1])
+			cylinder(r=m5ButtonHeadRadius, h=smidge);
+			
+			translate([0, 0, baseHeight+m5HeadHeight])
+			scale([1.2, 1, 1])
+			cylinder(r=m5ButtonHeadRadius, h=smidge);
+		}
+		translate([0, 0, baseHeight])
+		scale([1.2, 1, 1])
+		cylinder(r=m5ButtonHeadRadius, h=m5HeadHeight+smidge);
+	}
+}
+
+
+if (debug)
+{
+	keyBakLifter();
+}
+else
+{
+	// Rotate for printing, and do two of them.
+	translate([-height/2, -(ySize/2-3), xSize/2])
+	rotate([0, 90+atan((xSize-topDiameter)/(2*height)), 0])
+	keyBakLifter();
+	
+	translate([height/2, ySize/2-3, xSize/2])
+	rotate([0, 90+atan((xSize-topDiameter)/(2*height)), 180])
+	keyBakLifter();
+}