fix: make rear strap brackets side-feed

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

@@ -1,7 +1,7 @@
 // RemoteRig camera node case v4
 // Upright appliance-style OpenSCAD prototype for a strap-mounted camera node.
 // Units: millimeters. Coordinate system: X=width, Y=depth/front-back, Z=height.
-// Front/service lid is on the -Y face. Rear zip-tie pass-through loops are on the +Y face.
+// Front/service lid is on the -Y face. Rear side-feed zip-tie brackets are on the +Y face.
 //
 // v4 visual direction: tall/upright appliance/control box matching the original
 // reference image, replacing the rejected wide, low generic electronics box.
@@ -50,10 +50,10 @@ rocker_h = 19.0;
 front_slot_w = 34.0;         // two long rounded horizontal slots near lower front
 front_slot_h = 3.2;
 
-// Rear reusable cloth zip-tie / Velcro pass-through loops.
-// Two visibly vertical external belt-loop brackets sit left/right of center.
-// The strap path is the real non-solid tunnel between rear wall and raised bridge;
-// it stays outside the electronics cavity and is open at the top/bottom for feeding.
+// Rear reusable cloth zip-tie / Velcro pass-through brackets.
+// Two visibly vertical external brackets sit left/right of center.
+// The strap path is a lateral X-direction tunnel between the sealed rear wall
+// and raised bridge face; long side windows stay open for feeding from either side.
 rear_loop_x = 13.0;
 rear_loop_w = 8.5;            // outside bracket width in X
 rear_loop_h = 50.0;           // outside bracket height in Z
@@ -61,8 +61,8 @@ rear_loop_z = case_h/2;
 rear_loop_gap_y = 3.8;        // usable strap-thickness clearance behind raised bridge
 rear_loop_face_t = 1.4;       // low-profile outer bridge skin
 rear_loop_y = rear_loop_gap_y + rear_loop_face_t;
-rear_loop_usable_w = 6.4;     // usable strap width through each vertical loop
-rear_loop_side_pad = (rear_loop_w - rear_loop_usable_w) / 2;
+rear_loop_anchor_h = 5.0;     // top/bottom weld pads; side window remains long vertically
+rear_loop_side_window_h = rear_loop_h - 2*rear_loop_anchor_h;
 
 // USB power connector placeholder cutouts
 usb_c_cutout_w = 10.5;        // bottom USB-C female inlet visible opening, X width
@@ -114,26 +114,27 @@ module screw_boss(x, z) {
 
 module rear_zip_tie_loop(xc) {
     // Vertical external belt-loop bracket for reusable cloth zip ties/Velcro.
-    // The central void is a real strap tunnel: rear wall -> air gap -> raised
-    // outer bridge face. Side pads weld the bridge to the shell while keeping
-    // the electronics cavity sealed; the tunnel is open at top and bottom.
+    // The bracket silhouette remains vertical, but the real strap tunnel runs
+    // laterally in X through the long side windows, behind the raised bridge face.
+    // Top/bottom pads weld the bridge to the shell; no cut reaches the rear wall.
     loop_overlap_y = 0.75;
-    tunnel_extra_y = 0.35;
-    tunnel_clear_z = rear_loop_h + 0.8;
+    pad_r = 1.15;
+    bridge_y_center = case_d/2 + rear_loop_gap_y + rear_loop_face_t/2;
+    pad_y_center = case_d/2 + rear_loop_y/2 - loop_overlap_y;
+    pad_z_offset = rear_loop_h/2 - rear_loop_anchor_h/2;
 
-    translate([xc, case_d/2 + rear_loop_y/2 - loop_overlap_y, rear_loop_z])
-        difference() {
-            xz_rounded_prism(rear_loop_w, rear_loop_y, rear_loop_h, r=1.6);
+    union() {
+        // Raised vertical bridge face: visually preserves the requested vertical
+        // rear brackets while spanning the side-feed tunnel externally.
+        translate([xc, bridge_y_center, rear_loop_z])
+            xz_rounded_prism(rear_loop_w, rear_loop_face_t, rear_loop_h, r=1.6);
 
-            // Real vertical feed-through gap behind the raised bridge.  Starts
-            // just outside the rear wall, so it cannot cut into the enclosure.
-            translate([0,
-                       -rear_loop_y/2 + loop_overlap_y + rear_loop_gap_y/2 + 0.08,
-                       0])
-                cube([rear_loop_usable_w,
-                      rear_loop_gap_y + tunnel_extra_y,
-                      tunnel_clear_z], center=true);
-        }
+        // Top and bottom anchor pads close the old top-to-bottom feed direction
+        // and tie the raised face back into the rear wall without opening the case.
+        for (zoff = [-pad_z_offset, pad_z_offset])
+            translate([xc, pad_y_center, rear_loop_z + zoff])
+                xz_rounded_prism(rear_loop_w, rear_loop_y, rear_loop_anchor_h, r=pad_r);
+    }
 }
 
 // ----- Printable body -----
@@ -145,7 +146,7 @@ module camera_node_body_v4() {
                     // Upright outer shell with softened appliance-like corners.
                     rounded_box([case_w, case_d, case_h], r=corner_r);
 
-                    // Rear cloth zip-tie / Velcro pass-through loops kept flat/quiet.
+                    // Rear cloth zip-tie / Velcro side-feed brackets kept flat/quiet.
                     rear_zip_tie_loop(-rear_loop_x);
                     rear_zip_tie_loop( rear_loop_x);
                 }