Add G1 hardware modification STLs, photos and README

.gitattributes

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 # Video files - compressed
 *.mp4 filter=lfs diff=lfs merge=lfs -text
 *.webm filter=lfs diff=lfs merge=lfs -text
+STLs/arducam_holder.stl filter=lfs diff=lfs merge=lfs -text
+STLs/head_camera_holder.stl filter=lfs diff=lfs merge=lfs -text
+STLs/robot[[:space:]]backpack[[:space:]]v2[[:space:]]with[[:space:]]faceplate.stl filter=lfs diff=lfs merge=lfs -text
+STLs/robot[[:space:]]backpack[[:space:]]v2.stl filter=lfs diff=lfs merge=lfs -text
+STLs/unitree-g1-openarm-adapter.stl filter=lfs diff=lfs merge=lfs -text

README.md

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+---
+license: apache-2.0
+tags:
+- robotics
+- lerobot
+- unitree
+- g1
+- openarm
+- hardware
+---
+
+# Unitree G1 Hardware Modifications
+
+Custom 3D-printable parts and reference photos for modifying the Unitree G1: OpenArm grippers on
+the wrists, an extra head camera, and a backpack enclosure for the CAN-FD interface and cabling.
+
+Everything here is printable geometry plus photos of the assembled result — there is no
+firmware or control code in this repo.
+
+## Modifications
+
+### 1. Gripper on the G1 wrist
+
+The G1 wrist plate does not match the OpenArm gripper bolt pattern, so
+`STLs/unitree-g1-openarm-adapter.stl` sits between them. The white printed bracket carries the
+gripper actuator and its small driver PCB, and the aluminium linkage drives the two jaws.
+
+| Front | Mount side |
+| --- | --- |
+| ![Gripper, front view](media/gripper_front.jpeg) | ![Gripper adapter and actuator](media/gripper_mount.jpeg) |
+
+- `media/gripper_front.jpeg` — assembled gripper seen from the jaw side. The black fingers have
+  tape/foam padding added for grip on smooth objects.
+- `media/gripper_mount.jpeg` — rear of the same assembly, showing the actuator can, the printed
+  adapter arm, and the driver board mounted on the top face.
+
+### 2. Head camera
+
+An Arducam board camera is mounted on the front of the G1 head, just off-centre from the stock
+depth camera, using a printed holder that clips onto the face plate.
+
+![Arducam mounted on the G1 head](media/head_mount.jpeg)
+
+- `media/head_mount.jpeg` — camera board in place on the head. Note the cable routed down behind
+  the face plate.
+- `STLs/head_camera_holder.stl` — the holder that mounts to the head.
+- `STLs/arducam_holder.stl` — the smaller cradle that holds the Arducam board itself.
+
+### 3. Backpack enclosure
+
+A printed box on the G1's back holds the CAN-FD adapter (a SavvyCAN 2CH CAN-FD unit in the
+photos) and takes up the slack in the gripper and camera cabling. It mounts over the existing
+torso rails, and the removable faceplate gives access without unmounting the box.
+
+| Open | Closed |
+| --- | --- |
+| ![Backpack open, showing CAN-FD adapter](media/backpack_open.jpeg) | ![Backpack closed on the robot's back](media/backpack_closed.jpeg) |
+
+- `media/backpack_open.jpeg` — faceplate removed, showing the CAN-FD adapter and the cable loom.
+- `media/backpack_closed.jpeg` — faceplate on, as the robot runs.
+- `STLs/robot backpack v2.stl` — the box body on its own.
+- `STLs/robot backpack v2 with faceplate.stl` — body plus faceplate, for printing both at once.
+
+## Files
+
+### `STLs/`
+
+| File | Modification | Notes |
+| --- | --- | --- |
+| `unitree-g1-openarm-adapter.stl` | Gripper | Adapter between the G1 wrist and the OpenArm gripper |
+| `head_camera_holder.stl` | Head camera | Mounts to the G1 head face plate |
+| `arducam_holder.stl` | Head camera | Cradle for the Arducam board |
+| `robot backpack v2.stl` | Backpack | Enclosure body |
+| `robot backpack v2 with faceplate.stl` | Backpack | Enclosure body and faceplate together |

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STLs/robot backpack v2 with faceplate.stl

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STLs/unitree-g1-openarm-adapter.stl

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