Enhanced documentation and final hardware corrections

Documentation Improvements:
- Added comprehensive 'Problems Addressed' section explaining the value proposition
- Covers power supply issues, CAN communication problems, safety concerns, and wiring challenges
- Removed JST-XH internal USB port references from pinout sections
- Corrected via placement specification (DC/DC PGND instead of output)

Hardware Updates:
- Updated schema files with latest component changes
- Added custom footprints for XR76203ELTR-F and heat sink components
- Refined manufacturing guidelines for optimal thermal performance

The documentation now clearly articulates the EWS board's role in solving common
Voron 3D printer control system challenges.

EWS.kicad_pro

@@ -48,7 +48,7 @@
         "silk_text_thickness": 0.1,
         "silk_text_upright": false,
         "zones": {
-          "min_clearance": 0.25
+          "min_clearance": 0.1
         }
       },
       "diff_pair_dimensions": [
@@ -59,10 +59,6 @@
         }
       ],
       "drc_exclusions": [
-        [
-          "clearance|158115000|116550000|090319a2-984c-412d-9fea-9fcfc02e5074|77886cf6-68e5-4ef7-b4b6-664c5a95f538",
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         [
           "lib_footprint_mismatch|162470000|70480000|610ee3a1-cddb-4c0f-af4e-03d4d43dd8fd|00000000-0000-0000-0000-000000000000",
           ""
@@ -593,7 +589,7 @@
       "plot": "",
       "pos_files": "",
       "specctra_dsn": "",
-      "step": "",
+      "step": "EWS.step",
       "svg": "",
       "vrml": ""
     },

EWS.kicad_sch

@@ -6,8 +6,8 @@
 	(paper "A4")
 	(title_block
 		(title "EWS - Power, CANbus and USB HAT for 3D Printers")
-		(date "2025-12-03")
+		(date "2025-12-04")
-		(rev "1.0")
+		(rev "0.1")
 		(company "Eduard Iten")
 	)
 	(lib_symbols

README.de.md

@@ -15,6 +15,7 @@ Ein universelles Interface-Board (HAT) für Raspberry Pi 4/5 und Radxa Rock 5B z
 - [🔌 Universal Voron Power & CAN HAT (EWS)](#-universal-voron-power--can-hat-ews)
   - [📚 Inhalt](#-inhalt)
   - [🎯 Über EWS](#-über-ews)
+  - [🚨 Gelöste Probleme](#-gelöste-probleme)
   - [✨ Features](#-features)
     - [🔋 Stromversorgung (24V Eingang)](#-stromversorgung-24v-eingang)
     - [⚡ DC/DC Wandler (5V Ausgang)](#-dcdc-wandler-5v-ausgang)
@@ -44,6 +45,36 @@ Ein universelles Interface-Board (HAT) für Raspberry Pi 4/5 und Radxa Rock 5B z
 
 Das Board adressiert häufige Problemstellen in Voron-Builds durch robuste Stromverteilung, zuverlässige CAN-Kommunikation und praktische USB-Konnektivität bei gleichzeitiger Kompatibilität mit Raspberry Pi und Radxa Rock 5B Single-Board-Computern.
 
+## 🚨 Gelöste Probleme
+
+Dieses Board wurde entwickelt, um mehrere kritische Probleme zu lösen, die häufig bei Hochleistungs-3D-Drucker-Setups auftreten:
+
+### ⚡ **Strom- & Versorgungsprobleme**
+- **Instabile SBC-Stromversorgung** - Viele Setups leiden unter Spannungsabfällen und Strominstabilität
+- **Separate Power Injection erforderlich** - USB-C-Touchscreens benötigen oft zusätzliche Netzteile
+- **Komplexe Stromverteilung** - Mehrere Stromquellen erschweren die Verkabelung
+
+### 🔗 **CAN-Kommunikationsprobleme**
+- **USB-CAN-Adapter** - Schwer zu montieren, unzuverlässige Verbindungen, zusätzliche Fehlerquellen
+- **Controller-Board-Limitationen** - Spider/Octopus als CAN-Bridge haben oft eingebaute Abschlusswiderstände
+- **CAN-Topologie-Konflikte** - CAN-Toolheads und ADXL-Boards können nicht gleichzeitig an vielen Controller-Boards betrieben werden
+- **Native CAN nicht verfügbar** - Die meisten SBC-Setups nutzen keine nativen CAN-Interfaces
+
+### 🔥 **Sicherheitsbedenken**
+- **Brandgefahr durch Thermal Runaway** - Keine Möglichkeit, Toolhead-Strom bei Notfällen zu trennen
+- **Unkontrollierte Stromversorgung** - Toolheads bleiben auch bei Fehlern unter Strom
+- **Begrenzte Notabschaltung** - Schwierig, umfassende Sicherheitsabschaltungen zu implementieren
+
+### 🔌 **Verkabelung & Installation**
+- **Komplexes Kabelmanagement** - CAN und 24V-Strom beginnen an verschiedenen Stellen
+- **Mehrere Anschlusspunkte** - Erhöht Fehlermöglichkeiten und Installationskomplexität
+- **Unzureichende Steckernormen** - Mix verschiedener Steckertypen schafft Verwirrung
+
+### 🖥️ **USB- & Peripherie-Probleme**
+- **Begrenzte USB-Anschlüsse** - SBCs haben oft unzureichende Hochleistungs-USB-Konnektivität
+- **USB-Hub-Limitationen** - Externe Hubs erhöhen Komplexität und potentielle Fehlerquellen
+- **Power-Delivery-Standards** - Inkonsistente USB-C-Stromversorgung für moderne Touchscreens
+
 ## ✨ Features
 
 ### 🔋 Stromversorgung (24V Eingang)
@@ -147,10 +178,6 @@ sensor_mcu: hat
 ### USB Anschlüsse
 - **USB-C:** Touchscreen-Verbindung (5V/3A Fähigkeit)
 - **USB-A:** Webcam-Verbindung (vertikale Montage)
-- **JST-XH Intern:** 5V, D-, D+, GND
-
-### Lüftersteuerung
-- **JST-XH 2-pin:** Lüftersteuerung (Pin 1: +5V, Pin 2: GND/PWM)
 
 ## 🛠️ PCB Spezifikationen
 
@@ -172,7 +199,7 @@ sensor_mcu: hat
 
 ### PCB-Fertigung
 - **Kupferdicke:** **2oz Kupfer empfohlen** für verbesserte thermische Leistung und Strombelastbarkeit
-- **Via-Spezifikationen:** Minimum 12-20 Vias am DC/DC-Ausgang für Thermal Management
+- **Via-Spezifikationen:** Minimum 12-20 Vias am DC/DC PGND für Thermal Management
 - **Impedanzkontrolle:** 90 Ω Differentiell für USB-Leiterbahnen (D+/D- Paare)
 
 ### Bestückungshinweise

README.md

@@ -15,6 +15,7 @@ A universal interface board (HAT) for Raspberry Pi 4/5 and Radxa Rock 5B designe
 - [🔌 Universal Voron Power & CAN HAT (EWS)](#-universal-voron-power--can-hat-ews)
   - [📚 Contents](#-contents)
   - [🎯 About EWS](#-about-ews)
+  - [🚨 Problems Addressed](#-problems-addressed)
   - [✨ Features](#-features)
     - [🔋 Power Supply (24V Input)](#-power-supply-24v-input)
     - [⚡ DC/DC Converter (5V Output)](#-dcdc-converter-5v-output)
@@ -44,6 +45,36 @@ A universal interface board (HAT) for Raspberry Pi 4/5 and Radxa Rock 5B designe
 
 The board addresses common pain points in Voron builds by providing robust power distribution, reliable CAN communication, and convenient USB connectivity while maintaining compatibility with both Raspberry Pi and Radxa Rock 5B single-board computers.
 
+## 🚨 Problems Addressed
+
+This board was designed to solve multiple critical issues commonly encountered in high-performance 3D printer setups:
+
+### ⚡ **Power & Supply Issues**
+- **Unstable SBC power supply** - Many setups suffer from voltage drops and power instability
+- **Separate power injection required** - USB-C touchscreens often need additional power supplies
+- **Power distribution complexity** - Multiple power sources create wiring challenges
+
+### 🔗 **CAN Communication Problems**
+- **USB-CAN adapters** - Difficult to mount, unreliable connections, additional failure points
+- **Controller board limitations** - Using Spider/Octopus as CAN bridge often has built-in termination resistors
+- **CAN topology conflicts** - Can't run both CAN toolheads and ADXL boards simultaneously on many controller boards
+- **Native CAN unavailable** - Most SBC setups lack proper native CAN interface utilization
+
+### 🔥 **Safety Concerns**
+- **Fire hazard from thermal runaway** - No way to disconnect toolhead power during emergencies
+- **Uncontrolled power delivery** - Toolheads remain powered even during faults
+- **Limited emergency shutdown** - Difficult to implement comprehensive safety cutoffs
+
+### 🔌 **Wiring & Installation**
+- **Complex cable management** - CAN and 24V power start from different locations
+- **Multiple connection points** - Increases failure modes and installation complexity
+- **Inadequate connector standards** - Mix of different connector types creates confusion
+
+### 🖥️ **USB & Peripheral Issues**
+- **Limited USB ports** - SBCs often lack sufficient high-power USB connectivity
+- **USB hub limitations** - External hubs add complexity and potential points of failure
+- **Power delivery standards** - Inconsistent USB-C power delivery for modern touchscreens
+
 ## ✨ Features
 
 ### 🔋 Power Supply (24V Input)
@@ -147,10 +178,6 @@ sensor_mcu: hat
 ### USB Ports
 - **USB-C:** Touchscreen connection (5V/3A capability)
 - **USB-A:** Webcam connection (vertical mount)
-- **JST-XH Internal:** 5V, D-, D+, GND
-
-### Fan Control
-- **JST-XH 2-pin:** Fan control (Pin 1: +5V, Pin 2: GND/PWM)
 
 ## 🛠️ PCB Specifications
 
@@ -172,7 +199,7 @@ sensor_mcu: hat
 
 ### PCB Manufacturing
 - **Copper Weight:** **2oz copper recommended** for improved thermal performance and current handling
-- **Via Specifications:** Minimum 12-20 vias at DC/DC output for thermal management
+- **Via Specifications:** Minimum 12-20 vias at DC/DC PGND for thermal management
 - **Impedance Control:** 90 Ω differential for USB traces (D+/D- pairs)
 
 ### Assembly Notes

conn.kicad_sch

@@ -6,8 +6,8 @@
 	(paper "A4")
 	(title_block
 		(title "EWS - Power, CANbus and USB HAT for 3D Printers")
-		(date "2025-12-03")
+		(date "2025-12-04")
-		(rev "1.0")
+		(rev "0.1")
 		(company "Eduard Iten")
 	)
 	(lib_symbols

mcu.kicad_sch

@@ -6,8 +6,8 @@
 	(paper "A4")
 	(title_block
 		(title "EWS - Power, CANbus and USB HAT for 3D Printers")
-		(date "2025-12-03")
+		(date "2025-12-04")
-		(rev "1.0")
+		(rev "0.1")
 		(company "Eduard Iten")
 	)
 	(lib_symbols
@@ -4663,6 +4663,16 @@
 		)
 		(uuid "fe4e382e-54b0-4105-a8d9-226a722cf379")
 	)
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+		(at 200.66 71.12 0)
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+			(justify left bottom)
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+	)
 	(label "uC USART TX"
 		(at 148.59 92.71 0)
 		(effects
@@ -4723,6 +4733,16 @@
 		)
 		(uuid "a57ea6e3-2562-4314-baed-100a0783cc61")
 	)
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+		(at 200.66 73.66 0)
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+			(justify left bottom)
+		)
+		(uuid "f689f4b7-4d83-4f1c-9a1c-9d2eb7fb5468")
+	)
 	(global_label "CAN_TX"
 		(shape output)
 		(at 205.74 118.11 0)

project.pretty/HeatSink_9x9x5.kicad_mod

@@ -0,0 +1,92 @@
+(footprint "HeatSink_9x9x5"
+	(version 20241229)
+	(generator "pcbnew")
+	(generator_version "9.0")
+	(layer "F.Cu")
+	(property "Reference" "REF**"
+		(at 0 -0.5 0)
+		(unlocked yes)
+		(layer "F.SilkS")
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+	(property "Value" "HeatSink_9x9x5"
+		(at 0 1 0)
+		(unlocked yes)
+		(layer "F.Fab")
+		(hide yes)
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+		(layer "F.CrtYd")
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project.pretty/IC_XR76203ELTR-F.kicad_mod

@@ -142,6 +142,30 @@
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 		(uuid "1cacd0bb-ea25-4476-b506-2a5c6d5a83c0")
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+		(drill 0.2)
+		(layers "*.Cu")
+		(remove_unused_layers no)
+		(solder_mask_margin 0)
+		(uuid "965b7f95-a641-410b-a62a-9f05ef889cf4")
+	)
+	(pad "19" thru_hole circle
+		(at 3.2 1.75)
+		(size 0.5 0.5)
+		(drill 0.2)
+		(layers "*.Cu")
+		(remove_unused_layers no)
+		(solder_mask_margin 0)
+		(uuid "eee07a54-b7d2-4958-8fb2-c531b6946903")
+	)
+	(pad "19" thru_hole circle
+		(at 3.6 0.25)
+		(size 0.5 0.5)
+		(drill 0.2)
+		(layers "*.Cu")
+		(remove_unused_layers no)
+		(solder_mask_margin 0)
+		(uuid "bc70d8be-edf8-4bf2-9a95-8e60b8bdf116")
+	)
+	(pad "19" thru_hole circle
+		(at 3.6 0.75)
+		(size 0.5 0.5)
+		(drill 0.2)
+		(layers "*.Cu")
+		(remove_unused_layers no)
+		(solder_mask_margin 0)
+		(uuid "738838ed-de19-475f-9667-af481e2f8bf9")
+	)
+	(pad "19" thru_hole circle
+		(at 3.6 1.25)
+		(size 0.5 0.5)
+		(drill 0.2)
+		(layers "*.Cu")
+		(remove_unused_layers no)
+		(solder_mask_margin 0)
+		(uuid "042486e6-a9b0-4ee3-b0c3-0c668f562338")
+	)
+	(pad "19" thru_hole circle
+		(at 3.6 1.75)
+		(size 0.5 0.5)
+		(drill 0.2)
+		(layers "*.Cu")
+		(remove_unused_layers no)
+		(solder_mask_margin 0)
+		(uuid "57c5aaa7-8567-4017-81e8-bd466c494b32")
+	)
 	(pad "20" smd rect
 		(at 2.592 -0.5)
 		(size 1.016 0.3)