diff --git a/SCAD/s-buffer-hook-uni.scad b/SCAD/s-buffer-hook-uni.scad
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+// PRUSA iteration4
+// s-buffer-hook-uni
+// GNU GPL v3
+// Josef Průša <iam@josefprusa.cz> and contributors
+// http://www.reprap.org/wiki/Prusa_Mendel
+// http://prusamendel.org
+
+
+module buffer_spacer_hook_uni()
+{
+    difference()
+    {
+        union()
+        {
+            // base block
+            translate([-8,-4,-6]) cube([13,41.5,12]);
+            
+            // hook
+            translate([-35,-4,-6]) cube([28,9,12]);
+            translate([-35,-4,-6]) cube([8,12,12]);
+            translate([-7,-4,-6]) rotate([0,0,45]) cube([8,8,12]);
+        }
+        
+        // hook edges
+        translate([-13,2,-7]) rotate([0,0,10]) cube([2,13,14]); 
+        
+
+        
+        // hold together screw
+        translate([0,-3.4,0]) rotate([-90,0,0]) cylinder(r=1.8, h=40, $fn=30);
+        translate([0,-7,0]) rotate([-90,0,0]) cylinder(r1=3.6, r2=3.15, h=6, $fn=6);
+        translate([0,36.5,0]) rotate([-90,0,0]) cylinder(r=3.5, h=6, $fn=30);
+        
+        // plates
+        for(i = [0 : 5])
+        {
+            translate([-5,6.5*i,-10]) cube([50,1.8,20]); 
+        }
+        
+        
+        // MK3 frame cut
+        translate([-13,-0,-6.5]) cube([5,7,13]);
+        
+        // cut
+        translate([3,1,-10]) cube([20,33,20]); 
+        
+        // edges
+        translate([2,-5,7]) rotate([0,45,0]) cube([20,70,20]); 
+        translate([2,-5,-7]) rotate([0,45,0]) cube([20,70,20]); 
+        translate([-2,1,-8]) rotate([0,45,0]) cube([20,32,20]); 
+        translate([-2,1,8]) rotate([0,45,0]) cube([20,32,20]); 
+        
+        
+        translate([-27,5.5,-7]) rotate([0,0,0]) cylinder(r=4.5, h=40, $fn=30);
+        translate([-31.5,5,-7]) cube([8,11,15]);
+        
+        
+        // hook edges
+        translate([-31.5,5,-7]) rotate([0,0,10]) cube([2,13,14]); 
+        translate([-33,-8,-7]) rotate([0,0,40]) cube([5,13,14]); 
+        
+        // selective infill
+        translate([-6.75,-3,0]) cube([0.5,8,1]); 
+        translate([-6.75,-3,-3]) cube([0.5,8,1]); 
+        translate([-6.75,-3,3]) cube([0.5,8,1]); 
+        
+    }
+}
+
+buffer_spacer_hook_uni();
+
+