add k9 max

K-Max-Series/K9 Max/README.md

@@ -18,25 +18,43 @@
 | Polling Rate | 1000 Hz (2.4 GHz) |
 | Hot-swap | Yes (Keychron low-profile optical/MX-compatible product family positioning) |
 | Firmware | QMK / VIA |
-| Firmware Source | [Link](https://github.com/Keychron/qmk_firmware/tree/wireless_playground/keyboards/keychron/k9_max) |
 
-## Repository Status
+## Included Files
 
-CAD files for this model have not been added to this repository yet. This folder is prepared so related hardware design files can be dropped in later.
+| File | Description |
+|---|---|
+| `K9_Max-US-Bottom-Case-20260616.stp` | US bottom case 3D CAD model |
+| `K9_Max-US_PCB-20260616.dxf` | US PCB DXF drawing |
+| `K9_Max-US_Top_Case-Aluminum-20260616.stp` | US top aluminum case 3D CAD model |
+| `K9_Max_US_Aluminum_Plate-20260616.dwg` | US aluminum plate 2D CAD drawing |
+| `K9_Max_US_Aluminum_Plate-20260616.pdf` | US aluminum plate reference drawing |
+| `K9_Max_US_Full_Model-20260616.stp` | US full keyboard 3D CAD model |
+
+## Downloads
 
-## Planned File Types
+> **Download note:** If a download link does not respond, copy the link and paste it directly into your browser's address bar. All links below are hosted on Keychron's official server and are safe to use.
 
-| File Type | Purpose |
+| File | Download Link |
 |---|---|
-| `stp` / `step` | Case, plate, and full assembly 3D models |
-| `dwg` | 2D plate and mechanical drawings |
-| `dxf` | Manufacturing-ready 2D geometry when available |
-| `pdf` | Reference drawings and dimension sheets |
+| `K9_Max-US-Bottom-Case-20260616.stp` | http://www.keychron.co:34568/keychron-github-assets/Keychron-Keyboards-Hardware-Design/K-Max-Series/K9%20Max/K9_Max-US-Bottom-Case-20260616.stp |
+| `K9_Max-US_PCB-20260616.dxf` | http://www.keychron.co:34568/keychron-github-assets/Keychron-Keyboards-Hardware-Design/K-Max-Series/K9%20Max/K9_Max-US_PCB-20260616.dxf |
+| `K9_Max-US_Top_Case-Aluminum-20260616.stp` | http://www.keychron.co:34568/keychron-github-assets/Keychron-Keyboards-Hardware-Design/K-Max-Series/K9%20Max/K9_Max-US_Top_Case-Aluminum-20260616.stp |
+| `K9_Max_US_Aluminum_Plate-20260616.dwg` | http://www.keychron.co:34568/keychron-github-assets/Keychron-Keyboards-Hardware-Design/K-Max-Series/K9%20Max/K9_Max_US_Aluminum_Plate-20260616.dwg |
+| `K9_Max_US_Aluminum_Plate-20260616.pdf` | http://www.keychron.co:34568/keychron-github-assets/Keychron-Keyboards-Hardware-Design/K-Max-Series/K9%20Max/K9_Max_US_Aluminum_Plate-20260616.pdf |
+| `K9_Max_US_Full_Model-20260616.stp` | http://www.keychron.co:34568/keychron-github-assets/Keychron-Keyboards-Hardware-Design/K-Max-Series/K9%20Max/K9_Max_US_Full_Model-20260616.stp |
+
+## Opening the Files
+
+| Format | Free Software | Commercial Software |
+|---|---|---|
+| `.stp` | FreeCAD, Onshape | Fusion 360, SolidWorks |
+| `.dwg` | LibreCAD (limited), QCAD | AutoCAD, DraftSight |
+| `.dxf` | LibreCAD, QCAD | AutoCAD, DraftSight |
+| `.pdf` | Any PDF viewer | - |
 
 ## Links
 
-- [Series Overview](../README.md)
-- [Firmware Source (K9 Max)](https://github.com/Keychron/qmk_firmware/tree/wireless_playground/keyboards/keychron/k9_max)
+- [Series Overview](https://github.com/Keychron/Keychron-Keyboards-Hardware-Design/blob/main/K-Max-Series/README.md)
 - [Main Repository](https://github.com/Keychron/Keychron-Keyboards-Hardware-Design)
 
 ## License