// ============================================================ // 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(); }