hardware/DESIGN_PIPELINE.md

@@ -2,30 +2,116 @@
 
 > Living queue for 3D-printed / physical hardware design work.
 
-## Active / Ready for prototype print
+## Active / Ready for CAD prototype
+
+### Camera node case v4 — status panel + strap mount
+
+**Status:** Parametric OpenSCAD source created; body/lid/preview STLs exported and validated watertight. Ready for CAD review, exact part measurement, and first prototype print.
+
+**Files:**
+
+- `hardware/case/camera-node-case-v4.scad`
+- `hardware/case/camera-node-case-v4-body.scad`
+- `hardware/case/camera-node-case-v4-lid.scad`
+- `hardware/case/camera-node-case-v4-preview.scad`
+- `hardware/case/camera-node-case-v4-body.stl`
+- `hardware/case/camera-node-case-v4-lid.stl`
+- `hardware/case/camera-node-case-v4-preview.stl`
+
+**Design direction:**
+
+- Stand-mounted camera node enclosure; the case still does **not** mount to the GoPro.
+- Primary mounting is now reusable cloth zip ties / Velcro straps through rear case channels, not a clamp/dovetail.
+- Front has a recessed/flush service lid similar to a field-service status panel.
+- Lid includes cutouts for:
+  - 1.3-inch OLED/status screen.
+  - separate 3 mm power LED.
+  - single 3 mm RGB status LED replacing red/green status LEDs.
+  - small rocker on/off switch.
+  - lower vent/style slots.
+- Body includes screw bosses, recessed lid pocket, lid locating geometry, bottom cable exit/strain-relief notch, and two rear horizontal strap channels to resist rotation on a stand.
+- Internal envelope is sized for known module dimensions plus service clearance:
+  - ESP32-C3 Super Mini: 22.5 × 18 mm.
+  - ESP-01S: ~24.7 × 14.3 × 12 mm.
+
+**Prototype display content target:**
+
+```text
+CAM 03   REC ●
+BAT 87%  LINK OK
+00:12:34
+```
+
+**Prototype dimensions to validate before production:**
+
+- Exact 1.3-inch OLED module dimensions:
+  - PCB width/height/thickness.
+  - active display/window width/height.
+  - connector side and ribbon/header clearance.
+  - mounting-hole positions, if using module screws or adhesive tape.
+- Rocker switch:
+  - snap-in cutout width/height.
+  - bezel/flange size.
+  - required panel thickness range.
+  - rear depth and terminal clearance.
+- LEDs:
+  - preferred holder/bezel style, if any.
+  - final hole diameter for 3 mm PWR LED and 3 mm RGB STAT LED.
+  - current-limiting resistor placement.
+- Wiring/service:
+  - USB cable diameter and bend radius.
+  - whether power enters through bottom notch, side notch, or panel connector.
+  - actual regulator/power distribution board footprint if used.
+- Fasteners:
+  - M2 vs M2.5 vs self-tapping screws for lid.
+  - pilot diameter, screw length, and head/counterbore diameter.
+- Mounting straps:
+  - cloth zip-tie / Velcro width and thickness.
+  - whether two strap paths are enough to prevent case rotation on the expected stand diameter.
+  - whether rear bridge edges need larger radii or TPU/silicone sleeve protection.
+- Printability:
+  - rear strap bridge bridging/support behavior.
+  - body/lid fit after PETG shrinkage.
+  - lid lip clearance and screw boss robustness.
+  - cable notch strength and strain relief.
+
+**Suggested OpenSCAD validation/export commands:**
+
+```bash
+openscad -o /tmp/camera-node-case-v4-body.stl hardware/case/camera-node-case-v4-body.scad
+openscad -o /tmp/camera-node-case-v4-lid.stl hardware/case/camera-node-case-v4-lid.scad
+openscad -o /tmp/camera-node-case-v4-preview.stl hardware/case/camera-node-case-v4-preview.scad
+```
+
+Latest validation: OpenSCAD reports `Simple: yes`; trimesh confirms body, lid, and preview STLs are watertight. Body and lid each export as a single connected printable component; preview includes separate non-print board guide volumes by design.
+
+Or with the main parametric selector:
+
+```bash
+openscad -D 'part="body"' -o /tmp/camera-node-case-v4-body.stl hardware/case/camera-node-case-v4.scad
+openscad -D 'part="lid"' -o /tmp/camera-node-case-v4-lid.stl hardware/case/camera-node-case-v4.scad
+openscad -D 'part="preview"' -o /tmp/camera-node-case-v4-preview.stl hardware/case/camera-node-case-v4.scad
+```
+
+## Prior prototype reference
 
 ### Tripod electronics case v3
 
-**Status:** STL generated and validated watertight.
+**Status:** Historical design reference. In this checkout, previous v3 SCAD/STL files are not present; v4 starts a new `hardware/case/` CAD source set.
 
-**Files:**
+**Previous design notes:**
-- `hardware/case/tripod-case-v3.scad`
-- `hardware/case/case-body-v3.stl`
-- `hardware/case/case-lid-v3.stl`
-- `hardware/case/tripod-clamp-v3.stl`
-- `hardware/case/full-case-preview-v3.stl`
 
-**Design notes:**
+- Held ESP32 + ESP8266 stack.
-- Holds ESP32 + ESP8266 stack.
 - Screw-on lid with vent slots.
 - Rear dovetail-style rail/socket interface.
 - Separate screw-tightened tripod clamp sized around a 35 mm stand/pole.
-- Clamp uses M3 hardware: one M3 screw across the clamp mouth, with an M3 nut trap.
+- Clamp used M3 hardware: one M3 screw across the clamp mouth, with an M3 nut trap.
 
-**Prototype questions:**
+**Reasons superseded by v4:**
-- Does the clamp close enough on smaller tripod legs, or do we need swappable inserts?
+
-- Does the dovetail hold under vibration without a retention screw?
+- User requested front status/service panel with OLED, LEDs, and rocker switch.
-- Are USB/LED/UART cutouts in the correct orientation for the actual boards?
+- Single RGB status LED replaces separate red/green status LEDs.
+- Strap channels are simpler and more adaptable than a dedicated clamp/dovetail for field stands.
 
 ## Backlog
 
@@ -36,6 +122,7 @@
 **Goal:** A printable enclosure for the RemoteRig hub/control panel using a 10.1-inch touchscreen and Raspberry Pi Zero / Zero 2 W.
 
 **Display target:**
+
 - Vendor/model: HZWDONE Raspberry Pi Screen 10.1" Touchscreen
 - Resolution: 1024×600
 - Interface: HDMI portable monitor
@@ -43,12 +130,14 @@
 - Compatibility listing: Raspberry Pi 5/4/3B/B+ and Windows 11/10/8
 
 **Initial assumptions to validate:**
+
 - Compute: Raspberry Pi Zero / Zero 2 W mounted behind or below the display.
 - Use case: RemoteRig local monitor/control panel at field recording setup.
 - Likely needs: front bezel, rear electronics cavity, Pi mounting posts, HDMI/USB/power cable exits, strain relief, ventilation, and optional tripod/stand mounting.
 - Because this is a 10.1" panel, design should prioritize rigidity: thicker bezel ribs, rear standoffs, and possibly a two-piece shell instead of a small snap case.
 
 **Required measurements before CAD:**
+
 - Product link or datasheet for the exact HZWDONE 10.1" variant.
 - Screen/PCB outer dimensions: width, height, thickness.
 - Active display opening dimensions.
@@ -60,6 +149,7 @@
 - Mounting preference: desktop kickstand, tripod clamp, VESA-style holes, handle, or combination.
 
 **Proposed design approach:**
+
 1. Create `hardware/display-case/`.
 2. Build a parametric OpenSCAD model with measured display/Pi dimensions.
 3. Split into printable parts: front bezel, rear shell, Pi/controller tray, optional stand/tripod mount.

hardware/README.md

@@ -1,89 +1,147 @@
 # RemoteRig — Camera Node Hardware Design
 
-> **Version:** 0.2.0 | **Status:** Draft  
+> **Version:** 0.3.0 | **Status:** v4 CAD prototype ready for measurement/print validation  
-> **Target:** GoPro Hero 3 Black/Silver + ESP8266 + ESP32 + USB power bank
+> **Target:** GoPro Hero 3 Black/Silver + ESP32-C3 Super Mini + ESP-01S + USB power bank
 
 ## Overview
 
-Each camera node is two ESP boards in a small case that clips to the tripod/stand. The case **does not attach to the camera** — only to the stand. Powered by a standard USB power bank.
+Each camera node is two ESP boards in a small stand-mounted case. The case **does not attach to the camera**; it straps to a tripod/lighting stand with reusable cloth zip ties / Velcro straps. Powered by a standard USB power bank.
 
 ```
      ┌─────────────────┐
      │  USB Power Bank │── USB ──→ GoPro (power only)
-     │  (off-the-shelf)│── USB ──→ ESP32 + ESP8266 (shared)
+     │  (off-the-shelf)│── USB ──→ Camera Node Case
      └─────────────────┘
               │
-     ┌────────┴────────┐
+     ┌────────┴────────────────────────────┐
-     │  Tripod Case    │ ← clips to stand leg
+     │  Camera Node Case v4                │ ← Velcro/cloth straps to stand
-     │  ┌────────────┐ │
+     │  ┌──────────────────────────────┐   │
-     │  │ ESP8266    │ │ ← Wi-Fi → GoPro AP (10.5.5.1)
+     │  │ Flush/recessed service lid   │   │
-     │  │ (camera)   │ │
+     │  │ 1.3 OLED: CAM/REC/BAT/LINK   │   │
-     │  ├────────────┤ │ ← UART between boards
+     │  │ PWR LED + RGB STAT LED       │   │
-     │  │ ESP32      │ │ ← Wi-Fi → Travel Router
+     │  │ Small rocker power switch    │   │
-     │  │ (MQTT)     │ │
+     │  └──────────────────────────────┘   │
-     │  └────────────┘ │
+     │  ESP-01S camera bridge ↔ ESP32-C3   │
-     └─────────────────┘
+     └─────────────────────────────────────┘
 ```
 
 ## Bill of Materials
 
 | Item | Qty | Cost | Notes |
 |------|-----|------|-------|
-| ESP32 Dev Board | 1 | ~$5 | MQTT bridge — talks to hub |
+| ESP32-C3 Super Mini | 1 | ~$4–$6 | MQTT / hub-side bridge; known board envelope 22.5 × 18 mm |
-| ESP8266 D1 Mini | 1 | ~$3 | Camera bridge — talks to GoPro |
+| ESP-01S / ESP8266 module | 1 | ~$2–$3 | Camera-side GoPro Wi-Fi bridge; known envelope ~24.7 × 14.3 × 12 mm |
-| USB power bank (5000mAh+) | 1 | ~$10 | Powers both boards + GoPro |
+| 1.3-inch OLED/status screen | 1 | ~$4–$8 | Prototype CAD assumes ~31 × 16 mm visible window / ~35 × 19 mm panel clearance; confirm exact module |
-| Micro-USB cable (short) | 2 | ~$2 | Power bank → boards + GoPro |
+| 3 mm power LED | 1 | <$1 | Separate always-power/5V indicator |
-| Jumper wires F-F | 3 | ~$0.25 | UART TX/RX/GND between boards |
+| 3 mm RGB status LED | 1 | <$1 | Replaces separate red/green status LEDs; firmware can map node states to color |
-| PETG filament | ~25g | ~$0.50 | 3D printed case |
+| Small rocker switch | 1 | ~$1–$3 | On/off switch; prototype CAD assumes 13 × 19 mm snap-in opening |
-| Velcro strap (small) | 1 | ~$0.25 | Secure power bank to stand |
+| USB power bank (5000 mAh+) | 1 | ~$10 | Powers camera node and GoPro |
+| Short USB cables / wiring | as needed | ~$2–$5 | Power bank → node + GoPro; internal power/signal wiring |
+| M2 or small self-tapping screws | 4 | <$1 | Front service lid screws; pilot holes are parametric |
+| PETG filament | ~35–50 g | ~$1 | 3D printed case body + lid |
+| Reusable cloth zip ties / Velcro straps | 2 | ~$1 | Primary stand mount through rear strap channels |
 
-**Total per node:** ~$21 (+ GoPro already owned)
+**Total per node:** roughly ~$25–$35 plus GoPro and power bank, depending on display/switch choice.
 
 ## 3D Printed Case
 
-**Current source:** `hardware/case/tripod-case-v3.scad`
+**Current source:** `hardware/case/camera-node-case-v4.scad`  
 **Pipeline:** `hardware/DESIGN_PIPELINE.md`
 
-Four exported prototype files:
+The v4 case replaces the v3 clamp/dovetail concept with a simpler strap-mounted field enclosure:
-1. **Case body** — holds both boards stacked, cable ports, rear dovetail-style receiver
+
-2. **Case lid** — screw-on cover with ventilation
+1. **Case body** — shell sized around ESP32-C3 Super Mini + ESP-01S with service/wiring clearance.
-3. **Tripod clamp** — separate screw-tightened C-clamp sized around a 35mm stand/pole
+2. **Flush/recessed front service lid** — screw-on front status panel with locating lip.
-4. **Full preview** — combined visualization STL only, not intended as the print job
+3. **Front panel controls/indicators**:
+   - 1.3-inch OLED/status screen window.
+   - 3 mm **PWR** LED.
+   - single 3 mm **RGB STAT** LED for state-dependent colors.
+   - small rectangular rocker switch cutout.
+   - lower vent/style slots.
+4. **Rear strap channels** — two raised horizontal cloth zip-tie / Velcro strap paths to reduce rotation on a tripod/stand.
+5. **Bottom cable exit** — cable/strain-relief notch for USB/power wiring.
+
+### Export wrappers
+
+Simple per-part OpenSCAD wrappers are included:
+
+- `hardware/case/camera-node-case-v4-body.scad`
+- `hardware/case/camera-node-case-v4-lid.scad`
+- `hardware/case/camera-node-case-v4-preview.scad`
+
+Example CLI exports, if OpenSCAD is installed:
+
+```bash
+openscad -o hardware/case/camera-node-case-v4-body.stl hardware/case/camera-node-case-v4-body.scad
+openscad -o hardware/case/camera-node-case-v4-lid.stl hardware/case/camera-node-case-v4-lid.scad
+openscad -o hardware/case/camera-node-case-v4-preview.stl hardware/case/camera-node-case-v4-preview.scad
+```
+
+Or render the main file directly:
+
+```bash
+openscad -D 'part="body"' -o hardware/case/camera-node-case-v4-body.stl hardware/case/camera-node-case-v4.scad
+openscad -D 'part="lid"' -o hardware/case/camera-node-case-v4-lid.stl hardware/case/camera-node-case-v4.scad
+openscad -D 'part="preview"' -o hardware/case/camera-node-case-v4-preview.stl hardware/case/camera-node-case-v4.scad
+```
 
 ### Print Settings
-- **Material:** PETG preferred for heat/outdoor use and clamp flex
+
-- **Layer:** 0.2mm | **Infill:** 20% gyroid minimum; 35%+ recommended for clamp
+- **Material:** PETG preferred for heat/outdoor use and strap-tab durability.
-- **Supports:** Likely yes for clamp ears / dovetail overhangs depending on slicer orientation
+- **Layer:** 0.2 mm typical.
-- **Post-processing:** M3x8mm screws for lid (4x), one M3 screw + M3 nut for clamp tightening
+- **Infill:** 20% gyroid minimum; 30%+ recommended around rear strap bridges.
+- **Supports:** likely minimal/none depending on orientation; verify rear strap bridge spans and cable notch in slicer.
+- **Post-processing:** fit 4 lid screws; deburr OLED/LED/switch cutouts; soften strap-channel edges if the printed radius is too sharp for cloth ties.
+
+## Expected Status Screen Content
+
+Preferred 1.3-inch OLED layout/content style:
+
+```text
+CAM 03   REC ●
+BAT 87%  LINK OK
+00:12:34
+```
+
+Suggested fields:
+
+- `CAM` / node ID.
+- `REC` state with a clear recording indicator.
+- Battery percentage or supply estimate.
+- `LINK OK` / degraded / disconnected state.
+- Recording/session timer.
 
 ## Wiring
 
-```
+```text
 USB Power Bank
-  ├── USB-A → Micro-USB cable → ESP32 USB port
+  ├── USB-A → Camera Node Case
-  │                              (powers ESP32, shared 5V rail)
+  │       ├── rocker switch → node power rail
+  │       ├── PWR LED indicator
+  │       ├── ESP32-C3 Super Mini
+  │       ├── ESP-01S / ESP8266
+  │       ├── 1.3-inch OLED display
+  │       └── RGB status LED
   │
-  ├── USB-A → Micro-USB cable → GoPro USB port
+  └── USB-A → GoPro USB port
-  │                              (power only — no data)
+          (power only — no data)
-  │
-  └── (ESP8266 powered via ESP32 3.3V pin, or via shared USB)
 
-UART (inside case):
+UART / control inside case:
-  ESP8266 TX (GPIO1)  ──→ ESP32 RX (GPIO16)
+  ESP-01S TX  ──→ ESP32-C3 RX
-  ESP8266 RX (GPIO3)  ←── ESP32 TX (GPIO17)
+  ESP-01S RX  ←── ESP32-C3 TX
-  ESP8266 GND ─────────── ESP32 GND
+  ESP-01S GND ─── ESP32-C3 GND
 ```
 
-**Power note:** Both boards can be powered from a single USB cable if the ESP32's VIN/5V pin is bridged to the ESP8266's VIN. Alternatively, use a USB Y-splitter cable.
+**Power note:** exact wiring depends on the regulator/power board used. Confirm OLED voltage, LED current limiting, and whether the rocker switches USB 5 V input or a regulated node rail.
 
 ## Wi-Fi Topology
 
-```
+```text
-GoPro Hero 3 ──(AP @ 10.5.5.1)──→ ESP8266 (camera bridge)
+GoPro Hero 3 ──(AP @ 10.5.5.1)──→ ESP-01S / ESP8266 camera bridge
                                              │
                                         UART │ (inside case)
                                              │
-Travel Router ──(AP)─────────────────→ ESP32 (MQTT bridge)
+Travel Router ──(AP)────────────────────→ ESP32-C3 MQTT bridge
 (10.60.1.1)                                │
                                              │
                                         MQTT │
@@ -91,22 +149,30 @@ Travel Router ──(AP)─────────────────→ E
                                    Pi Hub (10.60.1.56)
 ```
 
-The ESP8266 and GoPro talk over Wi-Fi — **no data cable between them**. The only cable to the GoPro is USB power from the battery pack.
+The ESP8266/ESP-01S and GoPro talk over Wi-Fi. The only cable to the GoPro is USB power from the battery pack.
 
 ## Field Setup
 
-1. **Mount GoPro** on tripod/stand
+1. Mount GoPro on tripod/stand.
-2. **Clip case** to tripod leg
+2. Route two reusable cloth zip ties / Velcro straps through the rear v4 case channels.
-3. **Connect power bank** via USB to case + GoPro
+3. Strap the case to a tripod/stand leg; use both strap paths to resist rotation.
-4. **Power on** — ESP32 auto-connects to travel router, ESP8266 auto-connects to GoPro
+4. Connect power bank to case and GoPro.
-5. **Monitor** from `http://10.60.1.56:8080`
+5. Toggle rocker switch on.
+6. Verify PWR LED, RGB status LED, and OLED status: camera ID, REC state, battery, link, timer.
+7. Monitor from `http://10.60.1.56:8080`.
 
 ## Case Dimensions
 
-| | W × D × H (mm) |
+Prototype v4 nominal CAD dimensions:
+
+| Part / feature | W × D × H (mm) |
 |---|---|
-| Case body external | ~56.8 × 38.2 × 19.0 |
+| Case shell external | ~68 × 42 × 32 |
-| Lid external | ~56.8 × 32.8 × 4.0 |
+| Case with rear strap bridges | ~68 × 45.2 × 32 |
-| Tripod clamp | ~43.0 × 56.9 × 16.0 |
+| Front recessed lid | visible panel ~60 × 2 × 26; total with locating lip ~60 × 3 × 26 |
-| Clamp pole fit | Nominal 35mm; smaller poles TBD / may need inserts |
+| OLED visible window assumption | ~31 × 16 |
-| Total weight | TBD after prototype print |
+| Rocker cutout assumption | ~13 × 19 |
+| Rear strap channels | two horizontal pass-through paths, ~48 mm usable slot width, ~4.2 mm strap-thickness clearance |
+| Board clearance targets | ESP32-C3 22.5 × 18 mm + ESP-01S 24.7 × 14.3 × 12 mm plus wiring/service clearance |
+
+These dimensions are placeholders for the first CAD prototype. Measure the actual OLED module, rocker switch, LEDs, screws, USB cable bend radius, and strap width/thickness before committing to production prints.

hardware/case/camera-node-case-v4-body.scad

@@ -0,0 +1,4 @@
+// Export wrapper for RemoteRig camera node case v4 body.
+use <camera-node-case-v4.scad>
+
+camera_node_body_v4();

hardware/case/camera-node-case-v4-lid.scad

@@ -0,0 +1,4 @@
+// Export wrapper for RemoteRig camera node case v4 front service lid/status panel.
+use <camera-node-case-v4.scad>
+
+camera_node_lid_v4();

hardware/case/camera-node-case-v4-preview.scad

@@ -0,0 +1,4 @@
+// Export wrapper for RemoteRig camera node case v4 assembly preview.
+use <camera-node-case-v4.scad>
+
+camera_node_preview_v4();

hardware/case/camera-node-case-v4.scad

@@ -0,0 +1,237 @@
+// RemoteRig camera node case v4
+// Parametric OpenSCAD prototype for a status-panel camera node enclosure.
+// Units: millimeters.  Coordinate system: X=width, Y=depth/front-back, Z=height.
+// Front/service lid is on the -Y face. Rear strap channels are on the +Y face.
+//
+// Prototype assumptions to confirm against purchased parts:
+// - 1.3 inch OLED module/window opening: 31 x 16 mm visible window, 35 x 19 mm panel clearance.
+// - Small rocker switch cutout: 13 x 19 mm rectangular snap-in opening.
+// - LEDs: two 3 mm panel LEDs (PWR + RGB STAT) with 3.2 mm holes.
+// - Boards: ESP32-C3 Super Mini 22.5 x 18 mm, ESP-01S 24.7 x 14.3 x 12 mm.
+
+$fn = 48;
+
+// ----- Main enclosure parameters -----
+case_w = 68;                 // external width; room for OLED + LEDs + switch
+case_d = 42;                 // external depth; board stack + wiring clearance
+case_h = 32;                 // external height
+wall = 2.2;
+corner_r = 3.0;
+front_recess_d = 2.0;        // lid sits in this front pocket, nominally flush
+lid_clearance = 0.35;
+lid_w = case_w - 8;
+lid_h = case_h - 6;
+lid_t = 2.0;
+lid_lip_t = 1.2;             // locating lip protrudes inside service opening
+lid_lip_inset = 2.1;
+// Central body opening avoids the four corner screw bosses.  Separate local
+// clearances below handle the OLED/switch bodies without cutting away bosses.
+service_opening_w = 46.0;
+service_opening_h = 11.5;
+
+// Hardware
+screw_d = 2.4;               // M2 self-tapping / pilot; confirm hardware
+screw_head_d = 4.6;
+boss_d = 6.0;
+boss_len = 8.0;
+
+// Front panel components
+// OLED values are intentionally conservative prototype placeholders.
+oled_window_w = 31.0;
+oled_window_h = 16.0;
+oled_bezel_w = 35.0;         // engraved/recessed visual outline around window
+oled_bezel_h = 19.0;
+led_hole_d = 3.2;            // 3 mm LED clearance
+rocker_w = 13.0;             // prototype cutout; measure purchased rocker
+rocker_h = 19.0;
+vent_slot_w = 7.0;
+vent_slot_h = 1.7;
+
+// Rear reusable cloth zip-tie / Velcro strap channels
+strap_bridge_w = case_w - 12;
+strap_bridge_h = 7.5;        // outer raised tab height
+strap_slot_h = 4.2;          // strap thickness opening; adjust for cloth ties
+strap_gap_y = 3.2;           // clearance behind bridge for strap material
+strap_bridge_y = strap_gap_y + 2.2;
+strap_z1 = 8.5;
+strap_z2 = 23.5;
+
+// Cable exit
+cable_notch_w = 13.0;
+cable_notch_h = 6.0;
+
+// ----- Utility geometry -----
+module rounded_box(size=[10,10,10], r=2, center_xy=true) {
+    // Rounded in XY, straight in Z.
+    linear_extrude(height=size[2])
+        offset(r=r)
+            square([size[0]-2*r, size[1]-2*r], center=center_xy);
+}
+
+module y_cylinder(d, h, center=true) {
+    rotate([90,0,0]) cylinder(d=d, h=h, center=center);
+}
+
+module screw_boss(x, z) {
+    translate([x, -case_d/2 + front_recess_d + boss_len/2, z])
+        difference() {
+            y_cylinder(d=boss_d, h=boss_len);
+            y_cylinder(d=screw_d, h=boss_len + 0.8);
+        }
+}
+
+module strap_bridge(zc) {
+    // Raised rear bridge with a smooth-ish strap tunnel through it.
+    // It intentionally overlaps the main shell by ~2.2 mm so the STL is a
+    // single printable body, not separate coincident strap-tab volumes.
+    translate([0, case_d/2 + strap_bridge_y/2 - 2.2, zc - strap_bridge_h/2])
+        difference() {
+            rounded_box([strap_bridge_w, strap_bridge_y, strap_bridge_h], r=2.0);
+            // Through-slot for the cloth tie.  It cuts all the way through Y,
+            // while leaving side posts that tie the upper/lower rails together.
+            // Matching rear-wall cutouts are made in camera_node_body_v4().
+            translate([0, 0, (strap_bridge_h - strap_slot_h)/2])
+                rounded_box([strap_bridge_w - 8.0, strap_bridge_y + 0.8, strap_slot_h], r=1.2);
+        }
+}
+
+// ----- Printable body -----
+module camera_node_body_v4() {
+    difference() {
+        union() {
+            difference() {
+                union() {
+                    // Outer shell.
+                    translate([0,0,0]) rounded_box([case_w, case_d, case_h], r=corner_r);
+
+                    // Rear cloth zip-tie / Velcro strap bridges.
+                    strap_bridge(strap_z1);
+                    strap_bridge(strap_z2);
+                }
+
+            // Front recessed lid pocket (shallow, so the lid can sit flush).
+            translate([0, -case_d/2 - 0.2, case_h/2])
+                cube([lid_w + lid_clearance, front_recess_d + 0.3, lid_h + lid_clearance], center=true);
+
+            // Through service opening behind the lid, leaving a recessed ledge/frame.
+            service_depth = front_recess_d + wall + 2.0;
+            translate([0, -case_d/2 + service_depth/2, case_h/2])
+                cube([service_opening_w, service_depth + 0.4, service_opening_h], center=true);
+
+            // Local front clearances for the OLED module and rocker-switch body.
+            // These keep the screw-boss corner material intact while still leaving
+            // room for front-panel components and wiring to enter the body cavity.
+            translate([0, -case_d/2 + service_depth/2, (case_h - lid_h)/2 + lid_h - 9.5])
+                cube([oled_bezel_w + 2.0, service_depth + 0.4, oled_bezel_h + 3.0], center=true);
+            translate([15.5, -case_d/2 + service_depth/2, (case_h - lid_h)/2 + 12.0])
+                cube([rocker_w + 3.0, service_depth + 0.4, rocker_h + 3.0], center=true);
+
+            // Rear-wall pass-through slots for reusable cloth zip-ties / Velcro.
+            // The slots align with the raised bridges, so straps can thread through
+            // the back of the case instead of sitting in a closed decorative groove.
+            for (zc=[strap_z1, strap_z2])
+                translate([0, case_d/2 + 1.0, zc])
+                    cube([strap_bridge_w - 8.0, 8.0, strap_slot_h], center=true);
+
+            // Interior electronics cavity: ESP32-C3 Super Mini + ESP-01S plus wiring/service clearance.
+            cavity_d = case_d - front_recess_d - 2*wall;
+            translate([0, -case_d/2 + front_recess_d + wall + cavity_d/2, case_h/2])
+                cube([case_w - 2*wall, cavity_d, case_h - 2*wall], center=true);
+
+            // Bottom cable exit / strain-relief notch on lower front edge.
+            translate([0, -case_d/2 + 2.0, -0.05])
+                cube([cable_notch_w, 9.0, cable_notch_h], center=true);
+        }
+
+            // Four protected screw bosses are added after shell hollowing so the
+            // electronics cavity cannot cut away the receiving material.
+            screw_x = lid_w/2 - 5.0;
+            screw_z_low = (case_h - lid_h)/2 + 4.2;
+            screw_z_high = case_h - screw_z_low;
+            screw_boss(-screw_x, screw_z_low);
+            screw_boss( screw_x, screw_z_low);
+            screw_boss(-screw_x, screw_z_high);
+            screw_boss( screw_x, screw_z_high);
+        }
+
+        // Final body-level pilot holes cut through the front frame into the
+        // protected bosses. Without this pass the boss pilot holes can be
+        // hidden behind solid frame material.
+        screw_x = lid_w/2 - 5.0;
+        screw_z_low = (case_h - lid_h)/2 + 4.2;
+        screw_z_high = case_h - screw_z_low;
+        for (x=[-screw_x, screw_x], z=[screw_z_low, screw_z_high])
+            translate([x, -case_d/2 + front_recess_d + boss_len/2, z])
+                y_cylinder(d=screw_d, h=boss_len + front_recess_d + 4.0);
+    }
+}
+
+// ----- Printable front service lid / status panel -----
+module camera_node_lid_v4() {
+    difference() {
+        union() {
+            // Visible flush panel.
+            translate([0,0,0]) rounded_box([lid_w, lid_t, lid_h], r=0.65);
+
+            // Rear locating lip fits inside the central service opening and helps
+            // panel alignment.  Center it on the body's central opening so it
+            // does not collide with lower vent geometry.
+            lip_h = service_opening_h - 0.5;
+            translate([0, lid_t/2 + lid_lip_t/2 - 0.2, (lid_h - lip_h)/2])
+                rounded_box([service_opening_w - 0.5, lid_lip_t, lip_h], r=0.45);
+
+            // Shallow raised text pads/labels are omitted for print simplicity; add decals or paint-fill.
+        }
+
+        // OLED window and shallow module outline/recess.
+        translate([0, -0.2, lid_h - 9.5])
+            cube([oled_window_w, lid_t + lid_lip_t + 0.8, oled_window_h], center=true);
+        translate([0, -0.35, lid_h - 9.5])
+            cube([oled_bezel_w, 0.7, oled_bezel_h], center=true);
+
+        // LED holes: separate power LED and single RGB status LED.
+        translate([-17.0, -0.2, 11.5]) y_cylinder(d=led_hole_d, h=lid_t + lid_lip_t + 1.0);
+        translate([-9.0, -0.2, 11.5]) y_cylinder(d=led_hole_d, h=lid_t + lid_lip_t + 1.0);
+
+        // Rocker switch snap-in opening.
+        translate([15.5, -0.2, 12.0])
+            cube([rocker_w, lid_t + lid_lip_t + 1.0, rocker_h], center=true);
+
+        // Lower vent / style slots.
+        for (i=[-2:2])
+            translate([i*9.5, -0.2, 4.8])
+                cube([vent_slot_w, lid_t + lid_lip_t + 1.0, vent_slot_h], center=true);
+
+        // Screw clearance/counterbore holes.
+        screw_x = lid_w/2 - 5.0;
+        screw_z_low = 4.2;
+        screw_z_high = lid_h - screw_z_low;
+        for (x=[-screw_x, screw_x], z=[screw_z_low, screw_z_high]) {
+            translate([x, -0.2, z]) y_cylinder(d=screw_d + 0.4, h=lid_t + lid_lip_t + 1.0);
+            translate([x, -0.15, z]) y_cylinder(d=screw_head_d, h=1.2);
+        }
+    }
+}
+
+// ----- Non-print preview assembly -----
+module camera_node_preview_v4(show_lid=true) {
+    color("lightgray") camera_node_body_v4();
+    if (show_lid)
+        translate([0, -case_d/2 - lid_t - 0.25, (case_h - lid_h)/2])
+            color("gainsboro") camera_node_lid_v4();
+
+    // Internal board volume guides (not printed): ESP32-C3 and ESP-01S envelopes.
+    color([0,0.45,0,0.35]) translate([-13, -1, 9]) cube([22.5, 18, 4], center=true);
+    color([0,0.2,0.8,0.35]) translate([13, -1, 20]) cube([24.7, 14.3, 12], center=true);
+}
+
+// Select part to render from OpenSCAD CLI with: -D 'part="body"'
+part = "preview"; // "body", "lid", or "preview"
+
+if (part == "body") {
+    camera_node_body_v4();
+} else if (part == "lid") {
+    camera_node_lid_v4();
+} else {
+    camera_node_preview_v4();
+}