diff --git a/implementation/SCARA/hardware/openSCAD/carriage.json b/implementation/SCARA/hardware/openSCAD/carriage.json
index d864e83..ab97761 100644
--- a/implementation/SCARA/hardware/openSCAD/carriage.json
+++ b/implementation/SCARA/hardware/openSCAD/carriage.json
@@ -1,13 +1,5 @@
 {
     "parameterSets": {
-        "design default values": {
-            "arm1": "70",
-            "arm2": "55",
-            "arm_thickness": "3",
-            "arm_width": "10",
-            "position": "[65, 105]",
-            "stepper_spaceing": "45"
-        },
         "corner1": {
             "arm1": "70",
             "arm2": "55",
@@ -39,6 +31,20 @@
             "arm_width": "10",
             "position": "[85, 35]",
             "stepper_spaceing": "45"
+        },
+        "design default values": {
+            "arm1": "70",
+            "arm2": "55",
+            "arm_offset": "15",
+            "arm_thickness": "3",
+            "arm_width": "10",
+            "joint_bore": "3.2",
+            "set_screw_bore": "2.5",
+            "shaft_bore": "5.3",
+            "stepper_offset": "55",
+            "stepper_spaceing": "47",
+            "x": "55",
+            "y": "70"
         }
     },
     "parameterSets": "",
diff --git a/implementation/SCARA/hardware/openSCAD/carriage.scad b/implementation/SCARA/hardware/openSCAD/carriage.scad
index 434f02c..2679135 100644
--- a/implementation/SCARA/hardware/openSCAD/carriage.scad
+++ b/implementation/SCARA/hardware/openSCAD/carriage.scad
@@ -25,7 +25,7 @@ arm_width = 10;
 arm_offset = 15;
 
 bus_diameter = 3 + arm_width;
-shaft_bore = 5.15;
+shaft_bore = 5.3;
 joint_bore = 3.2;
 joint_spacing = arm_thickness+1;
 set_screw_bore = 2.5;
@@ -67,7 +67,7 @@ module arm5b(){
   arm5a();
   difference(){
     translate([-arm_thickness/2-2.5,35,-14]) rotate([0,0,180]) {sg90_bracket();
-     // sg90(-90);
+     sg90(-90);
     }
     translate([0,25,0]) rotate([0,90,0]) cylinder(d=7,h=10,center=true);
   }
@@ -104,26 +104,31 @@ module arm6(){
   arm_offset = 5+arm_thickness/2+1;
   difference(){
     union(){
+      // joint arms
       translate([0,0,arm_offset]) arm6a();
-      translate([0,0,arm_offset]) rotate([0,0,90]) arm6b();
       translate([0,0,-arm_offset]) arm6a();
+      // servo arm
+      translate([0,0,arm_offset]) rotate([0,0,90]) arm6b();
+      // cylinder for marker holder
       translate([0,30,0]) {
-       translate([-20+arm_width/2,0,0])  rotate([0,90,0]) cylinder(d=18,h=20);
+       translate([-20+arm_width/2,0,0])  rotate([0,90,0]) cylinder(d=20,h=20);
         translate([-5,0,0]) {
+          // added thinkness for setscrews
           rotate([-45,0,0]) cylinder(d=7,h=11);
           rotate([-135,0,0]) cylinder(d=7,h=11);
         }
       }
     }
     translate([0,30,0]){ 
-      translate([-20+arm_width/2-1,0,0])rotate([0,90,0]) cylinder(d=14.9,h=22);
+      // hole for marker
+      translate([-20+arm_width/2-1,0,0])rotate([0,90,0]) cylinder(d=16,h=22);
       translate([-5,0,0]) {
+      // holes for setscrew
       rotate([-45,0,0]) cylinder(d=set_screw_bore,h=40);
       rotate([-135,0,0]) cylinder(d=set_screw_bore,h=40);
       }
     }
   }
-
 }
 
 //!arm6();
@@ -143,6 +148,7 @@ translate([stepper_offset,0,0]) {
       difference(){
         arm([0,-25,arm1],arm_width,arm_thickness,joint_bore);
         cylinder(d=shaft_bore, h= 10, center=true);
+        translate([45,10,0]) cylinder(d=16, h=10, center=true);
       }
 
     //arm2
@@ -179,8 +185,10 @@ translate([40,0,-60]) rotate([-0,-90,0]){
 }
 
 //carriage
-translate([stepper_offset,0,0])
+translate([stepper_offset,0,0]){
   rotate([0,90,0]) {
     stepper_103H5205_bracket();
     translate([0,stepper_spaceing,0]) stepper_103H5205_bracket();
   }
+  translate([-53,-25.5,-25.5])cube([40,98,4]);
+}
diff --git a/implementation/SCARA/hardware/openSCAD/sg90.scad b/implementation/SCARA/hardware/openSCAD/sg90.scad
index 7b9c9b0..470acf2 100644
--- a/implementation/SCARA/hardware/openSCAD/sg90.scad
+++ b/implementation/SCARA/hardware/openSCAD/sg90.scad
@@ -24,17 +24,17 @@ module sg90_bracket_halve(){
 
 module sg90_bracket(){
 hull(){
-translate([-2,-2,0]) cube([2,27,13]);
-translate([-5,-2,8]) cube([5,27,5]);
+translate([-2,-2,0]) cube([2,27.8,13]);
+translate([-5,-2,8]) cube([5,27.8,5]);
 }
 translate([-2,-2,0]) cube([16,2,7]);
-translate([-2,23,0]) cube([16,2,7]);
-translate([-2,23,9.5]) cube([4,2,3.5]);
+translate([-2,23.8,0]) cube([16,2,7]);
+translate([-2,23.8,9.5]) cube([4,2,3.5]);
 translate([-2,-2,9.5]) cube([4,2,3.5]);
 
 difference(){
-translate([12.5,-2,0]) cube([1.5,27,7]);
-translate([17,11.5,4]) rotate([0,0,45]) cube([20,20,10],center=true);
+translate([13,-2,0]) cube([1.5,27.8,7]);
+translate([17.8,11.9,4]) rotate([0,0,45]) cube([20,20,10],center=true);
 }
 //import("servo-halter-sg90-1.stl");
 }
diff --git a/implementation/SCARA/hardware/openSCAD/wouter_3D_20200811.7z b/implementation/SCARA/hardware/openSCAD/wouter_3D_20200811.7z
new file mode 100644
index 0000000..7364aee
Binary files /dev/null and b/implementation/SCARA/hardware/openSCAD/wouter_3D_20200811.7z differ