diff --git a/openscad/foreign/sc808/fanholder-rear.png b/openscad/foreign/sc808/fanholder-rear.png
new file mode 100644
index 0000000..d032d06
Binary files /dev/null and b/openscad/foreign/sc808/fanholder-rear.png differ
diff --git a/openscad/foreign/sc808/fanholder-rear.scad b/openscad/foreign/sc808/fanholder-rear.scad
new file mode 100644
index 0000000..9a2764c
--- /dev/null
+++ b/openscad/foreign/sc808/fanholder-rear.scad
@@ -0,0 +1,85 @@
+// supermicro SC808 (and others) fan holder for 2x 40x40x28mm fans instead of 3x 40x40x56mm
+// by zeus - 2022-09-09 - CC-BY-NC-SA-4.0 - https://git.kostianix.de/zeus/3d-stuff/openscad/
+// #####################################
+$fn=100;
+mt=1.75;
+mt_center=22.5;
+nipple_offset=5.5;
+fan_w=42.0;
+fan_h=fan_w;
+fan_d=28.75;
+fan_holedist=32.2;
+fan_block_w=fan_w*0.55;
+base_w=2*fan_w+2*mt+mt_center;
+base_d=fan_d+2*mt+2*nipple_offset;
+base_h=10;
+base_hole_dist=161.50;
+base_hole_dia=6.4;
+base_hole_sleeve_h=4;
+base_hole_sleeve_dia=base_hole_dia+1.5;
+
+base_hole_y_offset=7.5;
+base_w_cpl=base_hole_dist+2*mt;
+base_w_tab=base_w_cpl/2-mt-mt_center/2-fan_w;
+// #####################################
+module fanblock(){
+    union(){    
+        difference(){
+            cube([base_w,base_d,base_h],center=true);
+            cube([base_w-2*mt,base_d-2*mt,base_h+0.1],center=true);
+            for (x=[-mt_center/2-fan_w/2,-(-mt_center/2-fan_w/2)],y=[(fan_d+2*nipple_offset)/2-mt,-(fan_d+2*nipple_offset)/2+mt],z=[mt,-mt]){
+                translate([x,y,0]){
+                        rotate([90,0,0])translate([0,fan_w/2-base_h/2+mt,z])cylinder(r=fan_w/2,h=2*mt+0.1,center=true);
+                    }
+            }
+        }
+    for (x=[-mt_center/2-fan_w/2,-(-mt_center/2-fan_w/2)],y=[(fan_d+2*nipple_offset)/2-mt,-(fan_d+2*nipple_offset)/2+mt]){
+        translate([x,y,0]){
+            difference(){
+                cube([fan_block_w,2*mt,base_h],center=true);
+                rotate([90,0,0])translate([0,fan_w/2-base_h/2+mt,0])cylinder(r=fan_w/2,h=2*mt+0.1,center=true);
+            }
+        }
+    }
+    cube([mt_center,fan_d+2*nipple_offset,base_h],center=true);
+    }    
+}
+module sleeve(){
+    difference(){
+        cylinder(d=base_hole_sleeve_dia,h=base_hole_sleeve_h,center=true);
+        cylinder(d=base_hole_dia,h=base_hole_sleeve_h+0.1,center=true);
+    }
+}
+module tab(){
+    difference(){
+        hull(){
+            translate([-mt/2,0,0])cube([mt,base_d,mt],center=true);
+            translate([-base_w_tab,-base_hole_y_offset-mt,0])cylinder(r=base_hole_dia/2-1,h=mt,center=true);
+            translate([-base_w_tab,+base_hole_y_offset+mt,0])cylinder(r=base_hole_dia/2-1,h=mt,center=true);
+        }
+        translate([-base_hole_dist/2+base_w/2,base_hole_y_offset,0])#cylinder(d=base_hole_dia,h=mt+0.1,center=true);    
+        translate([-base_hole_dist/2+base_w/2,-base_hole_y_offset,0])cylinder(d=base_hole_dia,h=mt+0.1,center=true);    
+    }
+    translate([-base_hole_dist/2+base_w/2,base_hole_y_offset,base_hole_sleeve_h/2-mt/2])sleeve();
+    translate([base_hole_dist/2+base_w/2,base_hole_y_offset,base_hole_sleeve_h/2-mt/2])sleeve();
+    hull(){
+        translate([-mt/2,0,0])cube([mt,mt,mt],center=true);
+        translate([-mt/2,0,base_h-mt])cube([mt,mt,mt],center=true);
+        translate([-mt/2-base_w_tab,0,0])cube([mt,mt,mt],center=true);
+    }
+}
+module hole_control(){
+    for(x=[-base_hole_dist/2,base_hole_dist/2],y=[-base_hole_y_offset,base_hole_y_offset]){
+        translate([x,y,0])#cylinder(d=base_hole_dia-1,h=4*mt,center=true);
+        }
+}
+// #####################################
+translate([0,0,base_h/2])fanblock();
+
+translate([-base_w/2,0,mt/2])tab();
+rotate([0,0,180])translate([-base_w/2,0,mt/2])tab();
+
+
+//hole_control();
+
+//translate([-6.25,-10.25,-base_h/2])%import("fanholdersrc.stl",center=true);
diff --git a/openscad/foreign/sc808/fanholder-rear.stl b/openscad/foreign/sc808/fanholder-rear.stl
new file mode 100644
index 0000000..c0b7cf5
Binary files /dev/null and b/openscad/foreign/sc808/fanholder-rear.stl differ
diff --git a/openscad/foreign/sc808/io-shield.scad b/openscad/foreign/sc808/io-shield.scad
index 6fb35fa..4d0c5fc 100644
--- a/openscad/foreign/sc808/io-shield.scad
+++ b/openscad/foreign/sc808/io-shield.scad
@@ -81,7 +81,7 @@ module shield_2(){
             shield_hole(-shield_w/2+mt/2,-0.5,4,0,-90); //left side
             shield_hole(-shield_w/2+mt/2+4.5,shield_h/2-shield_tab_emboss_d-mt/2-q*0.5,6.25,-90,0); //top side, 1st from left (recessed)
             shield_hole(-shield_w/2+mt/2+29.5,shield_h/2-mt/2,4.4,-90,0); //top side, 2nd from left 
-            shield_hole(-shield_w/2+mt/2+148,shield_h/2-mt/2,4.4,-90,0); //top side, 3rd from left
+            shield_hole(-shield_w/2+mt/2+147,shield_h/2-mt/2,4.4,-90,0); //top side, 3rd from left
             shield_hole(-shield_w/2+mt/2+162,shield_h/2-shield_tab_emboss_d-mt/2-q*0.5,5.5,-90,0); //top side, 4th from left (recessed)
             shield_hole(-shield_w/2+mt/2+171.5,shield_h/2-shield_tab_emboss_d-mt/2-q*0.5,6.25,-90,0); //top side, 5th from left (recessed)
             shield_hole(shield_w/2-mt/2,-0.5,4,0,90); //right side