diff --git a/chassis/canable_mount.scad b/chassis/canable_mount.scad
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+// ============================================================
+// canable_mount.scad — CANable 2.0 USB-CAN Adapter Cradle
+// Issue #654 / sl-mechanical  2026-03-16
+// ============================================================
+// Snap-fit cradle for CANable 2.0 PCB (~60 × 18 × 10 mm).
+// Attaches to 2020 aluminium T-slot rail via 2× M5 T-nuts.
+//
+// Port access:
+//   USB-C port       — X− end wall cutout (connector protrudes through)
+//   CAN terminal     — X+ end wall cutout (CANH / CANL / GND wire exit)
+//   LED status window— slot in Y+ side wall, PCB top-face LEDs visible
+//
+// Retention: snap-fit cantilever lips on both side walls (PETG flex).
+// Cable strain relief: zip-tie boss pair on X+ shelf (CAN wires).
+//
+// ⚠  VERIFY WITH CALIPERS BEFORE PRINTING:
+//    PCB_L, PCB_W          board outline
+//    USBC_W, USBC_H        USB-C shell at X− edge
+//    TERM_W, TERM_H        3-pos terminal block at X+ edge
+//    LED_X_CTR, LED_WIN_W  LED window position on Y+ wall
+//
+// Print settings (PETG):
+//   3 perimeters, 40 % gyroid infill, no supports, 0.2 mm layer
+//   Print orientation: open face UP (as modelled)
+//
+// BOM:
+//   2 × M5×10 BHCS  +  2 × M5 slide-in T-nut  (2020 rail)
+//
+// Export commands:
+//   openscad -D 'RENDER="mount"'    -o canable_mount.stl    canable_mount.scad
+//   openscad -D 'RENDER="assembly"' -o canable_assembly.png canable_mount.scad
+// ============================================================
+
+RENDER = "assembly"; // mount | assembly
+
+$fn = 48;
+EPS = 0.01;
+
+// ── ⚠ Verify before printing ─────────────────────────────────
+// CANable 2.0 PCB
+PCB_L    = 60.0;   // board length  (X: USB-C end → terminal end)
+PCB_W    = 18.0;   // board width   (Y)
+PCB_T    =  1.6;   // board thickness
+COMP_H   =  8.5;   // tallest component above board (USB-C shell ≈ 3.5 mm;
+                   //   terminal block ≈ 8.5 mm)
+
+// USB-C connector (at X− end face of PCB)
+USBC_W   =  9.5;   // connector outer width
+USBC_H   =  3.8;   // connector outer height above board surface
+USBC_Z0  =  0.0;   // connector bottom offset above board surface
+
+// CAN screw-terminal block (at X+ end face, 3-pos 5.0 mm pitch)
+TERM_W   = 16.0;   // terminal block span (3 × 5 mm + housing)
+TERM_H   =  9.0;   // terminal block height above board surface
+TERM_Z0  =  0.5;   // terminal bottom offset above board surface
+
+// Status LED window (LEDs near USB-C end on PCB top face)
+//   Rectangular slot cut in Y+ side wall — LEDs visible from the side
+LED_X_CTR  = 11.0;  // LED zone centre measured from PCB X− edge
+LED_WIN_W  = 14.0;  // window width (X)
+LED_WIN_H  =  5.5;  // window height (Z) — opens top portion of side wall
+
+// ── Cradle geometry ──────────────────────────────────────────
+WALL_T   = 2.5;    // side/end wall thickness
+FLOOR_T  = 4.0;    // floor plate thickness (accommodates M5 BHCS head pocket)
+CL_SIDE  = 0.30;   // Y clearance per side (total 0.6 mm play)
+CL_END   = 0.40;   // X clearance per end
+
+// Interior cavity
+INN_W    = PCB_W + 2*CL_SIDE;          // Y span
+INN_L    = PCB_L + 2*CL_END;           // X span
+INN_H    = PCB_T + COMP_H + 1.2;       // Z height (board + tallest comp + margin)
+
+// Outer body
+OTR_W    = INN_W  + 2*WALL_T;          // Y
+OTR_L    = INN_L  + 2*WALL_T;          // X
+OTR_H    = FLOOR_T + INN_H;            // Z
+
+// PCB reference origin within body (lower-left corner of board)
+PCB_X0   = WALL_T + CL_END;            // board X start inside body
+PCB_Y0   = WALL_T + CL_SIDE;           // board Y start inside body
+PCB_Z0   = FLOOR_T;                    // board bottom sits on floor
+
+// ── Snap-fit lips ─────────────────────────────────────────────
+// Cantilever ledge on inner face of each side wall, at PCB-top Z.
+// Tapered (chamfered) entry guides PCB in from above.
+SNAP_IN  = 0.8;    // how far inward ledge protrudes over PCB edge
+SNAP_T   = 1.2;    // snap-arm thickness (thin for PETG flex)
+SNAP_H   = 4.0;    // cantilever arm height (root at OTR_H, tip near PCB_Z0+PCB_T)
+SNAP_L   = 18.0;   // arm length along X (centred on PCB, shorter = more flex)
+// Snap on Y− wall protrudes in +Y direction; Y+ wall protrudes in −Y direction
+
+// ── M5 T-nut mount (2020 rail) ────────────────────────────────
+M5_D       =  5.3;   // M5 bolt clearance bore
+M5_HEAD_D  =  9.5;   // M5 BHCS head pocket diameter (from bottom face)
+M5_HEAD_H  =  3.0;   // BHCS head pocket depth
+M5_SPAC    = 20.0;   // bolt spacing along X (centred on cradle)
+// Standard M5 slide-in T-nuts used — no T-nut pocket moulded in.
+
+// ── Cable strain relief ───────────────────────────────────────
+// Two zip-tie anchor bosses on a shelf inside the X+ end, straddling
+// the CAN terminal wires.
+SR_BOSS_OD =  7.0;   // boss outer diameter
+SR_BOSS_H  =  5.5;   // boss height above floor
+SR_SLOT_W  =  3.5;   // zip-tie slot width
+SR_SLOT_T  =  2.2;   // zip-tie slot through-height
+// Boss Y positions (straddle terminal block)
+SR_Y1      = WALL_T + INN_W * 0.25;
+SR_Y2      = WALL_T + INN_W * 0.75;
+SR_X       = OTR_L - WALL_T - SR_BOSS_OD/2 - 2.5;  // just inside X+ end wall
+
+// ─────────────────────────────────────────────────────────────
+module canable_mount() {
+    difference() {
+        // ── Outer solid body ──────────────────────────────────
+        union() {
+            cube([OTR_L, OTR_W, OTR_H]);
+
+            // ── Snap cantilever arms on Y− wall (protrude inward +Y) ──
+            // Arms hang down from top of Y− wall inner face.
+            // Root is flush with inner face (Y = WALL_T); tip at PCB level.
+            translate([OTR_L/2 - SNAP_L/2, WALL_T - SNAP_T, OTR_H - SNAP_H])
+                cube([SNAP_L, SNAP_T, SNAP_H]);
+
+            // ── Snap cantilever arms on Y+ wall (protrude inward −Y) ──
+            translate([OTR_L/2 - SNAP_L/2, OTR_W - WALL_T, OTR_H - SNAP_H])
+                cube([SNAP_L, SNAP_T, SNAP_H]);
+
+            // ── Cable strain relief bosses (X+ end, inside) ────
+            for (sy = [SR_Y1, SR_Y2])
+                translate([SR_X, sy, 0])
+                    cylinder(d=SR_BOSS_OD, h=SR_BOSS_H);
+        }
+
+        // ── Interior cavity ───────────────────────────────────
+        translate([WALL_T, WALL_T, FLOOR_T])
+            cube([INN_L, INN_W, INN_H + EPS]);
+
+        // ── USB-C cutout — X− end wall ────────────────────────
+        // Centred on PCB width; opened from board surface upward
+        translate([-EPS,
+                   PCB_Y0 + PCB_W/2 - (USBC_W + 1.5)/2,
+                   PCB_Z0 + USBC_Z0 - 0.5])
+            cube([WALL_T + 2*EPS, USBC_W + 1.5, USBC_H + 2.5]);
+
+        // ── CAN terminal cutout — X+ end wall ─────────────────
+        // Full terminal width + 2 mm margin for screwdriver access;
+        // height clears terminal block + wire bend radius
+        translate([OTR_L - WALL_T - EPS,
+                   PCB_Y0 + PCB_W/2 - (TERM_W + 2.0)/2,
+                   PCB_Z0 + TERM_Z0 - 0.5])
+            cube([WALL_T + 2*EPS, TERM_W + 2.0, TERM_H + 5.0]);
+
+        // ── LED status window — Y+ side wall ─────────────────
+        // Rectangular slot; LEDs at top-face of PCB are visible through it
+        translate([PCB_X0 + LED_X_CTR - LED_WIN_W/2,
+                   OTR_W - WALL_T - EPS,
+                   OTR_H - LED_WIN_H])
+            cube([LED_WIN_W, WALL_T + 2*EPS, LED_WIN_H + EPS]);
+
+        // ── M5 BHCS head pockets (from bottom face of floor) ──
+        for (mx = [OTR_L/2 - M5_SPAC/2, OTR_L/2 + M5_SPAC/2])
+            translate([mx, OTR_W/2, -EPS]) {
+                // Clearance bore through full floor
+                cylinder(d=M5_D, h=FLOOR_T + 2*EPS);
+                // BHCS head pocket from bottom face
+                cylinder(d=M5_HEAD_D, h=M5_HEAD_H + EPS);
+            }
+
+        // ── Snap-arm ledge slot — Y− arm (hollow out to thin arm) ──
+        // Arm is SNAP_T thick; cut away material behind arm
+        translate([OTR_L/2 - SNAP_L/2 - EPS, EPS, OTR_H - SNAP_H])
+            cube([SNAP_L + 2*EPS, WALL_T - SNAP_T - EPS, SNAP_H + EPS]);
+
+        // ── Snap-arm ledge slot — Y+ arm ──────────────────────
+        translate([OTR_L/2 - SNAP_L/2 - EPS, OTR_W - WALL_T + SNAP_T, OTR_H - SNAP_H])
+            cube([SNAP_L + 2*EPS, WALL_T - SNAP_T - EPS, SNAP_H + EPS]);
+
+        // ── Snap-arm inward ledge notch (entry chamfer removed) ─
+        // Chamfer top of snap arm so PCB slides in easily
+        // Y− arm: chamfer on upper-inner edge → 45° wedge on +Y/+Z corner
+        translate([OTR_L/2 - SNAP_L/2 - EPS,
+                   WALL_T - SNAP_T - EPS,
+                   OTR_H - SNAP_IN])
+            rotate([0, 0, 0])
+            rotate([45, 0, 0])
+                cube([SNAP_L + 2*EPS, SNAP_IN * 1.5, SNAP_IN * 1.5]);
+
+        // Y+ arm: chamfer on upper-inner edge
+        translate([OTR_L/2 - SNAP_L/2 - EPS,
+                   OTR_W - WALL_T + SNAP_T - SNAP_IN * 1.5 + EPS,
+                   OTR_H - SNAP_IN])
+            rotate([45, 0, 0])
+                cube([SNAP_L + 2*EPS, SNAP_IN * 1.5, SNAP_IN * 1.5]);
+
+        // ── Snap ledge cutout on Y− arm inner tip ─────────────
+        // Creates inward nub: remove top portion of arm inner tip
+        // leaving bottom SNAP_IN height as the retaining ledge
+        translate([OTR_L/2 - SNAP_L/2 - EPS,
+                   WALL_T - SNAP_T - EPS,
+                   PCB_Z0 + PCB_T + SNAP_IN])
+            cube([SNAP_L + 2*EPS, SNAP_T + 2*EPS,
+                  OTR_H - (PCB_Z0 + PCB_T + SNAP_IN) + EPS]);
+
+        // ── Snap ledge cutout on Y+ arm inner tip ─────────────
+        translate([OTR_L/2 - SNAP_L/2 - EPS,
+                   OTR_W - WALL_T - EPS,
+                   PCB_Z0 + PCB_T + SNAP_IN])
+            cube([SNAP_L + 2*EPS, SNAP_T + 2*EPS,
+                  OTR_H - (PCB_Z0 + PCB_T + SNAP_IN) + EPS]);
+
+        // ── Zip-tie slots through strain relief bosses ─────────
+        for (sy = [SR_Y1, SR_Y2])
+            translate([SR_X, sy,
+                       SR_BOSS_H/2 - SR_SLOT_T/2])
+                rotate([0, 90, 0])
+                    cube([SR_SLOT_T, SR_SLOT_W,
+                          SR_BOSS_OD + 2*EPS],
+                         center=true);
+
+        // ── Weight relief pocket in floor (underside) ─────────
+        translate([WALL_T + 8, WALL_T + 3, -EPS])
+            cube([OTR_L - 2*WALL_T - 16, OTR_W - 2*WALL_T - 6,
+                  FLOOR_T - 1.5 + EPS]);
+    }
+}
+
+// ── Assembly preview ─────────────────────────────────────────
+if (RENDER == "assembly") {
+    color("DimGray", 0.93) canable_mount();
+
+    // Phantom PCB
+    color("MidnightBlue", 0.35)
+        translate([PCB_X0, PCB_Y0, PCB_Z0])
+            cube([PCB_L, PCB_W, PCB_T]);
+
+    // Phantom component block (top of PCB)
+    color("DarkSlateGray", 0.25)
+        translate([PCB_X0, PCB_Y0, PCB_Z0 + PCB_T])
+            cube([PCB_L, PCB_W, COMP_H]);
+
+    // USB-C port highlight
+    color("Gold", 0.8)
+        translate([-1,
+                   PCB_Y0 + PCB_W/2 - USBC_W/2,
+                   PCB_Z0 + USBC_Z0])
+            cube([WALL_T + 2, USBC_W, USBC_H]);
+
+    // Terminal block highlight
+    color("Tomato", 0.7)
+        translate([OTR_L - WALL_T - 1,
+                   PCB_Y0 + PCB_W/2 - TERM_W/2,
+                   PCB_Z0 + TERM_Z0])
+            cube([WALL_T + 2, TERM_W, TERM_H]);
+
+    // LED zone highlight
+    color("LimeGreen", 0.9)
+        translate([PCB_X0 + LED_X_CTR - LED_WIN_W/2,
+                   OTR_W - WALL_T - 0.5,
+                   OTR_H - LED_WIN_H + 1])
+            cube([LED_WIN_W, 1, LED_WIN_H - 2]);
+
+} else {
+    canable_mount();
+}