diff --git a/docs/machines/3DPrinter/Step by Step Assembly.md b/docs/machines/3DPrinter/Step by Step Assembly.md
index c8f1c11abfe023ec91c6ef6d2387a7aebf112ec4..75482bbd7e1dc76a1dfbf7761df733b05c504dd2 100644
--- a/docs/machines/3DPrinter/Step by Step Assembly.md	
+++ b/docs/machines/3DPrinter/Step by Step Assembly.md	
@@ -4,35 +4,37 @@ The build instructions below are divided into two parts, namely pre-assembly and
 
 ## Pre-Assembly
 
-
-### 1. Y-axis Left Pre-assembly (1) 
-   Parts required:
-   1. XY Idler Assembly Left (1)
-      1. Printed XY Idler - Left (1)
-         1. M3 Nut (2)
-         2. M3x20mm bolt (1)
-      2. M3x30mm bolt (1)
-      3. 3mm Bore GT2 Pulleys (2)
-      4. M3 shim washer (4)
-   2. XY Stepper Motor Assembly Left (1)
-      1. Printed Stepper Motor Bracket - Left (1)
-         1. M3 Nut (1)
-         2. M3x20mm bolt (1)
-      2. Nema 17 Motor (1)
-      3. GT2 20T Teethed 5 mm Bore Drive Pulley (1)
-      4. M3x8mm bolt (1)
-      5. M3x10mm bolt (2)
-   3. 10mm dia 340mm long Smooth Rod (1)
-   4. LMW10U Bearing (1)
+### 1. Y-axis Left Pre-assembly (1)
+ 
+Parts required:
+
+1. XY Idler Assembly Left (1)
+   1. Printed XY Idler - Left (1)
+      1. M3 Nut (2)
+      2. M3x20mm bolt (1)
+   2. M3x30mm bolt (1)
+   3. 3mm Bore GT2 Pulleys (2)
+   4. M3 shim washer (4)
+2. XY Stepper Motor Assembly Left (1)
+   1. Printed Stepper Motor Bracket - Left (1)
+      1. M3 Nut (1)
+      2. M3x20mm bolt (1)
+   2. Nema 17 Motor (1)
+   3. GT2 20T Teethed 5 mm Bore Drive Pulley (1)
+   4. M3x8mm bolt (1)
+   5. M3x10mm bolt (2)
+3. 10mm dia 340mm long Smooth Rod (1)
+4. LMW10U Bearing (1)
 
 #### 1.1 Subassembly - XY Idler Left
 
- Parts required:
-   1. XY Idler Assembly Left (1)
-      1. Printed XY Idler - Left (1)
-         1. M3 Nut (2)
-         2. M3x20mm bolt (1)
-      2. M3x30mm bolt (1)
+Parts required:
+
+1. XY Idler Assembly Left (1)
+   1. Printed XY Idler - Left (1)
+      1. M3 Nut (2)
+      2. M3x20mm bolt (1)
+         1. M3x30mm bolt (1)
       3. 3mm Bore GT2 Pulleys (2)
       4. M3 shim washer (4)
       5. Tool: #2.5 Allen Wrench (#2.5 Inbus)
@@ -115,6 +117,12 @@ The build instructions below are divided into two parts, namely pre-assembly and
       3. M3x8mm bolt (1)
       4. M3x10mm bolt (2)
 
+Instructions:
+- Insert M3 nut (1) into Printed Stepper Motor Bracket
+- Insert M3x20mm SHCS but do not tighten so as to deform plastic
+- Place bracket on Nema17 motor with wires as shown
+- 
+
 ##### Before and After Assembly
 
 | Before Assembly | After Assembly |
@@ -124,6 +132,18 @@ The build instructions below are divided into two parts, namely pre-assembly and
 
 <img src="pictures/yaxis_l_xystepper_cev.PNG" />
 
+#### 1.3 Subassembly - Y-axis smooth rod insertion
+
+   Parts required:
+   1. 10mm x 340mm long smooth rod (1)
+   2. Pre-assembled XY Idler Bracket Left
+   3. Pre-asssembled XY Stepper Bracket Left
+
+   Build Instructions:
+   1. Insert 10mm dia 340mm long smooth rod into the XY Idler Left on one end and into XY Stepper Left on other end, till rod is flush on outer face
+   2. Tighten the M3x20mm bolt on the XY Idler bracket till the 10mm smooth rod is fixed in place
+   3. Tighten the M3x20mm SHCS on the XY Stepper Bracket till the 10mm smooth rod is fixed in place
+
 ### 2. Y-axis Right Pre-assembly (1) 
 
 Repeat the same process as in Y-axis pre-aassembly Left. The XY Idler Right and XY Stepper Right are mirrored versions of the XY Idler Left and XY Stepper Left. 
@@ -132,13 +152,13 @@ Repeat the same process as in Y-axis pre-aassembly Left. The XY Idler Right and
    
    1. 2020 Profile 335mm long (2)
    2. 2020 Profile 140mm long (2)
-   3. Corner Brackets 2020 (4)
+   3. Printed Corner Brackets (4)
       1. M5x8mm Bolt (2)
       2. M5 Hammernut (2)
    4. Z-Axis Bearing Holder (4)
       1. M5x10mm Bolt (4)
       2. M5 2020 Hammer Nuts (4)
-      3. LM12UU Bearing (2)
+      3. LM8UU Bearing (2)
    5. Z Nut Bracket (2)
        1. M5x10 Bolts (4)
        2. 2020 M5 Hammer Nuts (4)
@@ -152,19 +172,19 @@ Repeat the same process as in Y-axis pre-aassembly Left. The XY Idler Right and
        4.  M3 Hand Tightening Nuts (1)
 
 
-1. Z-axis lower mount (2)
+### 4. Z-axis lower mount (2)
     1. M3x25 Bolts (2)
     2. M3 Nut (2)
     3. M5x10 Bolts (4)
     4. M5 Hammernut (4)
 
-2. Z-axis upper mount (2)
+### 5. Z-axis upper mount (2)
    1. M3x25mm bolt (2)
    2. M3 Nut (2)
    3. M5x10 Bolts (4)
    4. M5 Hammernut (4)
 
-3. Y-Carriage Pre-assembly (2)
+### 6. Y-Carriage Pre-assembly (2)
    1. Y-Carriage Printed Part (1)
    2. M3 Heatset Insert (4)
    3. M3 Nut (4)
@@ -173,14 +193,17 @@ Repeat the same process as in Y-axis pre-aassembly Left. The XY Idler Right and
    6. GT2 20T Teethed 3mm Bore Smooth Idler Pulley (1)
    7. X-End Stop Flag (1)
 
-5.  X-carriage Pre-assembly (1)
-   8. Printed X-Carriage (1)
-   9. M3 Heatset Insert (10)
-   10. M3x14mm Bolt (4)
-   11. 3mm dia 12mm long Dowel Pins (4)
-   12. LM8UU Bearing (3)
+Instructions:
+   1. Insert 
 
-6.  Extruder Mount Pre-Assembly (1)
+### 7. X-carriage Pre-assembly (1)
+   1. Printed X-Carriage (1)
+   2. M3 Heatset Insert (10)
+   3. M3x14mm Bolt (4)
+   4. 3mm dia 12mm long Dowel Pins (4)
+   5. LM8UU Misumi Bearing (3)
+
+### 8. Extruder Mount Pre-Assembly (1)
     1. Printed Extruder Mount (1)
       1. M3 nut (4)
          1. Insert 2 nuts for extruder motor mount
@@ -192,21 +215,22 @@ Repeat the same process as in Y-axis pre-aassembly Left. The XY Idler Right and
        4. 2pin JST-XT Female Connector (1)
     3. M3x6mm bolt (1)
 
-7.  Exhaust Housing Preassembly (1)
-   13. Exhaust Housing (1)
+### 9.  Exhaust Pre-assembly (1)
+  
+  1. Exhaust Housing (1)
         1.  M3 Heatset insert (7)
         2.  PTFE Tube Through Connector (1)
         3.  6020 Fan (1)
         4.  M3x12mm bolt (4)
-   14. Exhaust Grill (1)
-   15. Exhaust Mount Left (1)
-   16. Exhaust Mount Right (1)
-   17. Filters (5)
-   18. Exhaust Rear Cover (1)
+   1. Exhaust Grill (1)
+   2. Exhaust Mount Bracket (2)
+   3. Carbon Filter (2)
+   4. Fan Mount (1)
+
+### 10.  Dual Z drive Pre-assembly (1)
 
-8.  Dual Z Mount Pulley Pre-assembly
 
-9.  Power Supply Unit (PSU) Pre-Assembly (1)
+2.  Power Supply Unit (PSU) Pre-Assembly (1)
     1.  Meanwell 350W PSU (1)
     2.  PSU Back Cover (1)
     3.  PSU Front Cover (2)
@@ -217,7 +241,7 @@ Repeat the same process as in Y-axis pre-aassembly Left. The XY Idler Right and
     8.  Power Switch (1)
     9.  M3x8mm bolt (2) 
 
-10. Electronics Assembly
+3.  Electronics Assembly
     1.  MKS Sbase v1.3  Controller Board
         1.  M3x10mm bolt (4)
     2.  24-12V Step Down Converter
@@ -225,21 +249,21 @@ Repeat the same process as in Y-axis pre-aassembly Left. The XY Idler Right and
     3.  LCD Controller
         1.  M3x8mm bolt (2)
 
-11. Door Hinges (3)
+4.  Door Hinges (3)
     1.  Hinge Inner (1)
     2.  Hinge Outer (1)
     3.  M3 Nut (1)
     4.  M3x30mm Bolt (1)
 
-12. Y-axis EndStop Assembly
+5.  Y-axis EndStop Assembly
     1.  Mechanical Endstop
     2.  Endstop holder
     3.  Endstop top cover
     4.  M3x8mm bolt (1)
 
-13. X-Y Cable chain assembly
+6.  X-Y Cable chain assembly
 
-14. LCD Display with casing assembly
+7.  LCD Display with casing assembly
     1.  MKS TFT32 Display
     2.  LCD Bottom Cover
     3.  LCD Top Cover