diff --git a/app/data/cfg.json b/app/data/cfg.json
index 573de1b..2334ef9 100644
--- a/app/data/cfg.json
+++ b/app/data/cfg.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.8.0",
+  "version": "1.8.1",
   "ext_port": 1111,
   "profiles": {
     "mcopy": {
diff --git a/app/package-lock.json b/app/package-lock.json
index 0c5b791..d73190a 100644
--- a/app/package-lock.json
+++ b/app/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "mcopy-app",
-  "version": "1.8.0",
+  "version": "1.8.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
diff --git a/app/package.json b/app/package.json
index 66eb29d..3a60590 100644
--- a/app/package.json
+++ b/app/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mcopy-app",
-  "version": "1.8.0",
+  "version": "1.8.1",
   "description": "GUI for the mcopy small gauge film optical printer platform",
   "main": "main.js",
   "scripts": {
diff --git a/data/cfg.json b/data/cfg.json
index 573de1b..2334ef9 100644
--- a/data/cfg.json
+++ b/data/cfg.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.8.0",
+  "version": "1.8.1",
   "ext_port": 1111,
   "profiles": {
     "mcopy": {
diff --git a/package-lock.json b/package-lock.json
index 3bdcc7b..7d865f1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "mcopy",
-  "version": "1.8.0",
+  "version": "1.8.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "mcopy",
-      "version": "1.8.0",
+      "version": "1.8.1",
       "license": "MIT",
       "dependencies": {
         "arduino": "file:app/lib/arduino",
diff --git a/package.json b/package.json
index 51e3d64..8db4b1b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mcopy",
-  "version": "1.8.0",
+  "version": "1.8.1",
   "description": "Small gauge film optical printer platform",
   "main": "build.js",
   "directories": {
diff --git a/processing/mcopy/cfg.json b/processing/mcopy/cfg.json
index 573de1b..2334ef9 100644
--- a/processing/mcopy/cfg.json
+++ b/processing/mcopy/cfg.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.8.0",
+  "version": "1.8.1",
   "ext_port": 1111,
   "profiles": {
     "mcopy": {
diff --git a/scad/rails_2020.scad b/scad/rails_2020.scad
index 7035bc9..850ce25 100644
--- a/scad/rails_2020.scad
+++ b/scad/rails_2020.scad
@@ -1,3 +1,10 @@
+/**
+ * Optical Printer Rails
+ * 
+ * Camera Drive = +X
+ * Lens Drive = -X
+ **/
+
 use <2020_profile.scad>
 //include <jk_rails.scad>
 include <./common/common.scad>
@@ -7,6 +14,13 @@ include <./common/rods.scad>
 RailSpacing = 100;
 ThreadedRodSpacing = 50;
 RailEndX = 140;
+TNutVoid = 17;
+
+module rail_debug (H = 175) {
+    color("lime") linear_extrude(height=H) {
+        2020_profile();
+    }
+}
 
 module m3_bolt_void (pos = [0, 0, 0], BoltH = 20, CapH = 3) {
 	D = 3.25;
@@ -35,6 +49,13 @@ module bolt_voids_motor (pos = [0, 0, 0]) {
     }
 }
 
+module T_nut_void (pos = [0, 0, 0], rot = [0, 0, 0]) {
+    translate(pos) rotate(rot) {
+        cylinder(r = R(TNutDiameter2 + 0.1), h = TNutVoid + .01, center = true, $fn = 60);
+        translate([0, 0, -(TNutVoid / 2) + (6 / 2)]) cylinder(r = R(TNutDiameter1 + 0.1), h = 6.01, center = true, $fn = 60);
+    }
+}
+
 module rail_end (pos = [0, 0, 0], rot = [90, 0, 0], Motors = true) {
     translate(pos) rotate(rot) difference () {
         difference () {
@@ -50,10 +71,14 @@ module rail_end (pos = [0, 0, 0], rot = [90, 0, 0], Motors = true) {
         bolt_voids_2020([-RailSpacing / 2, 0, 0]);
         rotate([0, 180, 0]) bolt_voids_2020([-RailSpacing / 2, 0, 0]);
         if (Motors) {
+        
+            //camera drive motor
             translate([ThreadedRodSpacing / 2, 0, 0]) {
                 cylinder(r = R(NEMA17PadD + 0.5), h = 60, center = true, $fn = 100);
                 bolt_voids_motor([0, 0, 16]);
             }
+            
+            //lens drive motor
             translate([-ThreadedRodSpacing / 2, 0, 0]) {
                 cylinder(r = R(NEMA17PadD + 0.5), h = 60, center = true, $fn = 100);
                 bolt_voids_motor([0, 0, 16]);
@@ -72,9 +97,64 @@ module rail_end (pos = [0, 0, 0], rot = [90, 0, 0], Motors = true) {
     }
 }
 
-rail_end();
+module sled (pos = [0, 0, 0], rot = [90, 0, 0], Length = 50) {
+    X = RailEndX;
+    Y = 50;
+    Z = Length;
+    translate(pos) rotate(rot) difference () {
+        translate([0, 5, 0]) rounded_cube([X, Y, Z], d = 10, center = true, $fn = 50);
+        //extrusion rails
+        translate([-RailSpacing / 2, 0, 0]) cube([21, 21, Z + 1], center = true);
+        translate([RailSpacing / 2, 0, 0]) cube([21, 21, Z + 1], center = true);
+        //linear motion rod void
+        cylinder(r = R(LinearMotionDiameter + 0.2), h = Z + 1, center = true, $fn = 60);
+        
+        //linear motion rod bearing voids
+        translate([0, 0, (Length / 2) - (LinearBearingHeight / 2) + 0.01]) cylinder(r = R(LinearBearingOuterDiameter + 0.2), h = LinearBearingHeight, center = true, $fn = 100);
+        translate([0, 0, -(Length / 2) + (LinearBearingHeight / 2) - 0.01]) cylinder(r = R(LinearBearingOuterDiameter + 0.2), h = LinearBearingHeight, center = true, $fn = 100);
+        
+        //threaded rod voids
+        translate([ThreadedRodSpacing / 2, 0, 0]) cylinder(r = R(ThreadDiameter + 0.2), h = Z + 1, center = true, $fn = 60);
+        translate([-ThreadedRodSpacing / 2, 0, 0]) cylinder(r = R(ThreadDiameter + 0.2), h = Z + 1, center = true, $fn = 60);
+        
+    }
+}
 
-//translate([-35, 0, -25]) linear_extrude(height=175) 2020_profile();
+module camera_sled (pos = [0, 0, 0], rot = [0, 0, 0]) {
+    translate(pos) sled(Length = 110);
+}
+
+module lens_sled (pos = [0, 0, 0], rot = [90, 0, 0]) {
+    Y = 50;
+    LensDriveX = -ThreadedRodSpacing / 2;
+    translate(pos) rotate(rot) {
+        difference () {
+            sled(rot = [0, 0, 0], Length = Y);
+            T_nut_void ([LensDriveX, 0, (Y / 2) - (TNutVoid / 2) + 0.01], [180, 0, 0]);
+            T_nut_void ([LensDriveX, 0, -(Y / 2) + (TNutVoid / 2) - 0.01]);
+            //camera drive passthrough
+            translate([-LensDriveX, 0, 0]) cylinder(r = R(ThreadDiameter + 1), h = Y + 1, center = true, $fn = 60);
+        }
+        
+        //debug
+        translate([-ThreadedRodSpacing / 2, 0, -(Y / 2) + 8.4]) T_nut();
+        //translate([-ThreadedRodSpacing / 2, 0, (Y / 2) - 7.5]) rotate([180, 0, 0]) T_nut();
+    }
+
+}
+
+//rail_end();
+//camera_sled([0, -90, 0]);
+//lens_sled([0, -90, 0]);
+//difference () {
+//intersection() {
+    //lens_sled([0, -90, 0]);
+    //translate([-30, -90 + 30 - 1, 10]) cube([90, 60, 45], center = true);
+    //translate([0, -90, 50]) cube([200, 100, 100], center = true); 
+//}
+
+//debug
+//translate([-RailSpacing / 2, 0, 0]) rotate([90, 0, 0]) rail_debug(175);
 //translate([RailSpacing / 2, 0, 0]) rotate([90, 0, 0]) linear_extrude(height=175) 2020_profile();
 
 //translate([ThreadedRodSpacing / 2, 40, 0]) rotate([90, 0, 0])  color("blue") NEMA17();