464 lines
22 KiB
OpenSCAD
464 lines
22 KiB
OpenSCAD
// ============================================================
|
||
// uwb_anchor_mount.scad — Wall/Ceiling UWB Anchor Mount Bracket
|
||
// Issue: #564 Agent: sl-mechanical Date: 2026-03-14
|
||
// (supersedes Rev A stem-collar mount — see git history)
|
||
// ============================================================
|
||
//
|
||
// Parametric wall or ceiling mount bracket for ESP32 UWB Pro anchor.
|
||
// Designed for fixed-infrastructure deployment: anchors screw into
|
||
// wall or ceiling drywall/timber with standard M4 or #6 wood screws,
|
||
// at a user-defined tilt angle so the UWB antenna faces the desired
|
||
// coverage zone.
|
||
//
|
||
// Architecture:
|
||
// Wall base → flat backplate with 2× screw holes (wall or ceiling)
|
||
// Tilt knuckle → single-axis articulating joint; 15° detent steps
|
||
// locked with M3 nyloc bolt; range 0–90°
|
||
// Anchor cradle→ U-cradle holding ESP32 UWB Pro PCB on M2.5 standoffs
|
||
// USB-C channel→ routed groove on tilt arm + exit slot in cradle back wall
|
||
// Label slot → rear window slot for printed anchor-ID card strip
|
||
//
|
||
// Part catalogue:
|
||
// Part 1 — wall_base() Backplate + 2-ear pivot block + detent arc
|
||
// Part 2 — tilt_arm() Pivoting arm with knuckle + cradle stub
|
||
// Part 3 — anchor_cradle() PCB cradle, standoffs, USB-C slot, label window
|
||
// Part 4 — cable_clip() Snap-on USB-C cable guide for tilt arm
|
||
// Part 5 — assembly_preview()
|
||
//
|
||
// Hardware BOM:
|
||
// 2× M4 × 30 mm wood screws (or #6 drywall screws) wall fasteners
|
||
// 1× M3 × 20 mm SHCS + M3 nyloc nut tilt pivot bolt
|
||
// 4× M2.5 × 8 mm SHCS PCB-to-cradle
|
||
// 4× M2.5 hex nuts captured in standoffs
|
||
// 1× USB-C cable anchor power
|
||
//
|
||
// ESP32 UWB Pro interface (verify with calipers):
|
||
// PCB size : UWB_L × UWB_W × UWB_H (55 × 28 × 10 mm default)
|
||
// Mounting holes : M2.5, 4× corners on UWB_HOLE_X × UWB_HOLE_Y pattern
|
||
// USB-C port : centred on short edge, UWB_USBC_W × UWB_USBC_H
|
||
// Antenna area : top face rear half — 10 mm keep-out of bracket material
|
||
//
|
||
// Tilt angles (15° detent steps, set TILT_DEG before export):
|
||
// 0° → horizontal face-up (ceiling, antenna faces down)
|
||
// 30° → 30° downward (wall near ceiling) [default]
|
||
// 45° → diagonal (wall mid-height)
|
||
// 90° → vertical face-out (wall, antenna faces forward)
|
||
//
|
||
// RENDER options:
|
||
// "assembly" full assembly at TILT_DEG (default)
|
||
// "wall_base_stl" Part 1
|
||
// "tilt_arm_stl" Part 2
|
||
// "anchor_cradle_stl" Part 3
|
||
// "cable_clip_stl" Part 4
|
||
//
|
||
// Export commands:
|
||
// openscad uwb_anchor_mount.scad -D 'RENDER="wall_base_stl"' -o uwb_wall_base.stl
|
||
// openscad uwb_anchor_mount.scad -D 'RENDER="tilt_arm_stl"' -o uwb_tilt_arm.stl
|
||
// openscad uwb_anchor_mount.scad -D 'RENDER="anchor_cradle_stl"' -o uwb_anchor_cradle.stl
|
||
// openscad uwb_anchor_mount.scad -D 'RENDER="cable_clip_stl"' -o uwb_cable_clip.stl
|
||
// ============================================================
|
||
|
||
$fn = 64;
|
||
e = 0.01;
|
||
|
||
// ── Tilt angle (override per anchor, 0–90°, 15° steps) ───────────────────────
|
||
TILT_DEG = 30;
|
||
|
||
// ── ESP32 UWB Pro PCB dimensions (verify with calipers) ──────────────────────
|
||
UWB_L = 55.0; // PCB length
|
||
UWB_W = 28.0; // PCB width
|
||
UWB_H = 10.0; // PCB + components height
|
||
UWB_HOLE_X = 47.5; // M2.5 hole X span
|
||
UWB_HOLE_Y = 21.0; // M2.5 hole Y span
|
||
UWB_USBC_W = 9.5; // USB-C receptacle width
|
||
UWB_USBC_H = 4.0; // USB-C receptacle height
|
||
UWB_ANTENNA_L = 20.0; // antenna area at PCB rear (keep-out)
|
||
|
||
// ── Wall base geometry ────────────────────────────────────────────────────────
|
||
BASE_W = 60.0;
|
||
BASE_H = 50.0;
|
||
BASE_T = 5.0;
|
||
BASE_SCREW_D = 4.5; // M4 clearance
|
||
BASE_SCREW_HD = 8.5; // countersink OD
|
||
BASE_SCREW_HH = 3.5; // countersink depth
|
||
BASE_SCREW_SPC = 35.0; // Z span between screw holes
|
||
KNUCKLE_T = BASE_T + 4.0; // pivot ear depth (Y)
|
||
|
||
// ── Tilt arm geometry ─────────────────────────────────────────────────────────
|
||
ARM_W = 12.0;
|
||
ARM_T = 5.0;
|
||
ARM_L = 35.0;
|
||
PIVOT_D = 3.3; // M3 clearance
|
||
PIVOT_NUT_AF = 5.5;
|
||
PIVOT_NUT_H = 2.4;
|
||
DETENT_D = 3.2; // detent notch diameter
|
||
DETENT_R = 8.0; // detent notch radius from pivot
|
||
|
||
// ── Anchor cradle geometry ────────────────────────────────────────────────────
|
||
CRADLE_WALL_T = 3.5;
|
||
CRADLE_BACK_T = 4.0;
|
||
CRADLE_FLOOR_T = 3.0;
|
||
CRADLE_LIP_H = 4.0;
|
||
CRADLE_LIP_T = 2.5;
|
||
STANDOFF_H = 3.0;
|
||
STANDOFF_OD = 5.5;
|
||
LABEL_W = UWB_L - 4.0;
|
||
LABEL_H = UWB_W * 0.55;
|
||
LABEL_T = 1.2; // label card thickness
|
||
|
||
// ── USB-C cable routing ───────────────────────────────────────────────────────
|
||
USBC_CHAN_W = 11.0;
|
||
USBC_CHAN_H = 7.0;
|
||
|
||
// ── Cable clip ────────────────────────────────────────────────────────────────
|
||
CLIP_CABLE_D = 4.5;
|
||
CLIP_T = 2.0;
|
||
CLIP_BODY_W = 16.0;
|
||
CLIP_BODY_H = 10.0;
|
||
|
||
// ── Fasteners ─────────────────────────────────────────────────────────────────
|
||
M2P5_D = 2.7;
|
||
M3_D = 3.3;
|
||
M3_NUT_AF = 5.5;
|
||
M3_NUT_H = 2.4;
|
||
|
||
// ============================================================
|
||
// RENDER DISPATCH
|
||
// ============================================================
|
||
RENDER = "assembly";
|
||
|
||
if (RENDER == "assembly") assembly_preview();
|
||
else if (RENDER == "wall_base_stl") wall_base();
|
||
else if (RENDER == "tilt_arm_stl") tilt_arm();
|
||
else if (RENDER == "anchor_cradle_stl") anchor_cradle();
|
||
else if (RENDER == "cable_clip_stl") cable_clip();
|
||
|
||
// ============================================================
|
||
// ASSEMBLY PREVIEW
|
||
// ============================================================
|
||
module assembly_preview() {
|
||
// Ghost wall surface
|
||
%color("Wheat", 0.22)
|
||
translate([-BASE_W/2, -10, -BASE_H/2])
|
||
cube([BASE_W, 10, BASE_H + 40]);
|
||
|
||
// Wall base
|
||
color("OliveDrab", 0.85)
|
||
wall_base();
|
||
|
||
// Tilt arm at TILT_DEG, pivoting at knuckle
|
||
color("SteelBlue", 0.85)
|
||
translate([0, KNUCKLE_T, 0])
|
||
rotate([TILT_DEG, 0, 0])
|
||
tilt_arm();
|
||
|
||
// Anchor cradle at arm end
|
||
color("DarkSlateGray", 0.85)
|
||
translate([0, KNUCKLE_T, 0])
|
||
rotate([TILT_DEG, 0, 0])
|
||
translate([0, ARM_T, ARM_L])
|
||
anchor_cradle();
|
||
|
||
// PCB ghost
|
||
%color("ForestGreen", 0.38)
|
||
translate([0, KNUCKLE_T, 0])
|
||
rotate([TILT_DEG, 0, 0])
|
||
translate([-UWB_L/2,
|
||
ARM_T + CRADLE_BACK_T,
|
||
ARM_L + CRADLE_FLOOR_T + STANDOFF_H])
|
||
cube([UWB_L, UWB_W, UWB_H]);
|
||
|
||
// Cable clip at arm mid-point
|
||
color("DimGray", 0.70)
|
||
translate([ARM_W/2, KNUCKLE_T, 0])
|
||
rotate([TILT_DEG, 0, 0])
|
||
translate([0, ARM_T + e, ARM_L/2])
|
||
rotate([0, -90, 90])
|
||
cable_clip();
|
||
}
|
||
|
||
// ============================================================
|
||
// PART 1 — WALL BASE
|
||
// ============================================================
|
||
// Flat backplate screws to wall or ceiling with 2× countersunk
|
||
// M4/#6 wood screws on BASE_SCREW_SPC (35 mm) centres.
|
||
// Two pivot ears straddle the tilt arm; M3 pivot bolt passes through
|
||
// both ears and arm knuckle.
|
||
// Detent arc on inner face of +X ear: 7 notches at 15° steps (0–90°)
|
||
// so tilt can be set without a protractor.
|
||
// Shallow rear recess accepts a printed installation-zone label.
|
||
//
|
||
// Dual-use: flat face to wall (vertical screw axis) or flat face
|
||
// to ceiling (horizontal screw axis) — same part either way.
|
||
//
|
||
// Print: backplate flat on bed, PETG, 5 perims, 40 % gyroid.
|
||
module wall_base() {
|
||
ear_h = ARM_W + 3.0;
|
||
ear_t = 6.0;
|
||
ear_sep = ARM_W + 1.0;
|
||
|
||
difference() {
|
||
union() {
|
||
// ── Backplate ────────────────────────────────────────────────
|
||
translate([-BASE_W/2, -BASE_T, -BASE_H/2])
|
||
cube([BASE_W, BASE_T, BASE_H]);
|
||
|
||
// ── Two pivot ears ────────────────────────────────────────────
|
||
for (ex = [-(ear_sep/2 + ear_t), ear_sep/2])
|
||
translate([ex, -BASE_T + e, -ear_h/2])
|
||
cube([ear_t, KNUCKLE_T + e, ear_h]);
|
||
|
||
// ── Stiffening gussets ────────────────────────────────────────
|
||
for (ex = [-(ear_sep/2 + ear_t), ear_sep/2])
|
||
hull() {
|
||
translate([ex, -BASE_T, -ear_h/4])
|
||
cube([ear_t, BASE_T - 1, ear_h/2]);
|
||
translate([ex + (ex < 0 ? ear_t*0.6 : 0),
|
||
-BASE_T, -ear_h/6])
|
||
cube([ear_t * 0.4, 1, ear_h/3]);
|
||
}
|
||
}
|
||
|
||
// ── 2× countersunk wall screws ────────────────────────────────────
|
||
for (sz = [-BASE_SCREW_SPC/2, BASE_SCREW_SPC/2]) {
|
||
translate([0, -BASE_T - e, sz])
|
||
rotate([-90, 0, 0])
|
||
cylinder(d = BASE_SCREW_D, h = BASE_T + 2*e);
|
||
translate([0, -BASE_T - e, sz])
|
||
rotate([-90, 0, 0])
|
||
cylinder(d1 = BASE_SCREW_HD, d2 = BASE_SCREW_D,
|
||
h = BASE_SCREW_HH + e);
|
||
}
|
||
|
||
// ── Pivot bolt bore (M3, through both ears) ───────────────────────
|
||
translate([-(ear_sep/2 + ear_t + e), KNUCKLE_T * 0.55, 0])
|
||
rotate([0, 90, 0])
|
||
cylinder(d = PIVOT_D, h = ear_sep + 2*ear_t + 2*e);
|
||
|
||
// ── M3 nyloc nut pocket (outer face of one ear) ───────────────────
|
||
translate([ear_sep/2 + ear_t - PIVOT_NUT_H - 0.4,
|
||
KNUCKLE_T * 0.55, 0])
|
||
rotate([0, 90, 0])
|
||
cylinder(d = PIVOT_NUT_AF / cos(30),
|
||
h = PIVOT_NUT_H + 0.5, $fn = 6);
|
||
|
||
// ── Detent arc — 7 notches at 15° steps on +X ear inner face ─────
|
||
for (da = [0 : 15 : 90])
|
||
translate([ear_sep/2 - e,
|
||
KNUCKLE_T * 0.55 + DETENT_R * sin(da),
|
||
DETENT_R * cos(da)])
|
||
rotate([0, 90, 0])
|
||
cylinder(d = DETENT_D, h = ear_t * 0.45 + e);
|
||
|
||
// ── Installation label recess (rear face of backplate) ────────────
|
||
translate([0, -BASE_T - e, 0])
|
||
rotate([-90, 0, 0])
|
||
cube([BASE_W - 12, BASE_H - 16, 1.6], center = true);
|
||
|
||
// ── Lightening pocket ─────────────────────────────────────────────
|
||
translate([0, -BASE_T + 1.5, 0])
|
||
cube([BASE_W - 14, BASE_T - 3, BASE_H - 20], center = true);
|
||
}
|
||
}
|
||
|
||
// ============================================================
|
||
// PART 2 — TILT ARM
|
||
// ============================================================
|
||
// Pivoting arm linking wall_base pivot ears to anchor_cradle.
|
||
// Knuckle end (Z=0): M3 pivot bore + spring-plunger detent pocket
|
||
// that indexes into the base ear detent arc notches.
|
||
// Cradle end (Z=ARM_L): 2× M3 bolt attachment to cradle back wall.
|
||
// USB-C cable channel runs along outer (+Y) face, full arm length.
|
||
//
|
||
// Print: knuckle face flat on bed, PETG, 5 perims, 40 % gyroid.
|
||
module tilt_arm() {
|
||
total_h = ARM_L + 10;
|
||
|
||
difference() {
|
||
union() {
|
||
// ── Arm body ─────────────────────────────────────────────────
|
||
translate([-ARM_W/2, 0, 0])
|
||
cube([ARM_W, ARM_T, total_h]);
|
||
|
||
// ── Knuckle boss (rounded pivot end) ─────────────────────────
|
||
translate([0, ARM_T/2, 0])
|
||
rotate([90, 0, 0])
|
||
cylinder(d = ARM_W, h = ARM_T, center = true);
|
||
|
||
// ── Cradle attach stub (Z = ARM_L) ────────────────────────────
|
||
translate([-ARM_W/2, 0, ARM_L])
|
||
cube([ARM_W, ARM_T + CRADLE_BACK_T, ARM_T]);
|
||
}
|
||
|
||
// ── M3 pivot bore ─────────────────────────────────────────────────
|
||
translate([-ARM_W/2 - e, ARM_T/2, 0])
|
||
rotate([0, 90, 0])
|
||
cylinder(d = PIVOT_D, h = ARM_W + 2*e);
|
||
|
||
// ── Detent plunger pocket (3 mm spring-ball, outer +Y face) ──────
|
||
translate([0, ARM_T + e, 0])
|
||
rotate([90, 0, 0])
|
||
cylinder(d = 3.2, h = 4 + e);
|
||
|
||
// ── USB-C cable channel (outer +Y face, mid-arm length) ───────────
|
||
translate([-USBC_CHAN_W/2, ARM_T - e, ARM_T + 4])
|
||
cube([USBC_CHAN_W, USBC_CHAN_H, ARM_L - ARM_T - 8]);
|
||
|
||
// ── Cradle attach bolt holes (2× M3 at cradle stub) ───────────────
|
||
for (bx = [-ARM_W/4, ARM_W/4])
|
||
translate([bx, ARM_T/2, ARM_L + ARM_T/2])
|
||
rotate([90, 0, 0])
|
||
cylinder(d = M3_D, h = ARM_T + CRADLE_BACK_T + 2*e);
|
||
|
||
// ── M3 nut pockets (front of cradle stub) ─────────────────────────
|
||
for (bx = [-ARM_W/4, ARM_W/4])
|
||
translate([bx, ARM_T/2, ARM_L + ARM_T/2])
|
||
rotate([-90, 0, 0])
|
||
cylinder(d = M3_NUT_AF / cos(30),
|
||
h = M3_NUT_H + 0.5, $fn = 6);
|
||
|
||
// ── Lightening pocket ─────────────────────────────────────────────
|
||
translate([0, ARM_T/2, ARM_L/2])
|
||
cube([ARM_W - 4, ARM_T - 2, ARM_L - 18], center = true);
|
||
}
|
||
}
|
||
|
||
// ============================================================
|
||
// PART 3 — ANCHOR CRADLE
|
||
// ============================================================
|
||
// Open-front U-cradle for ESP32 UWB Pro PCB.
|
||
// PCB retained on 4× M2.5 standoffs matching UWB_HOLE_X × UWB_HOLE_Y.
|
||
// Back wall features:
|
||
// • USB-C exit slot — aligns with PCB USB-C port
|
||
// • USB-C groove — cable routes from slot toward arm channel
|
||
// • Label card slot — insert printed strip for anchor ID
|
||
// • Antenna keep-out — back wall material removed above antenna area
|
||
// Front lip prevents PCB from sliding forward.
|
||
// Two attachment tabs bolt to tilt_arm cradle stub.
|
||
//
|
||
// Print: back wall flat on bed, PETG, 5 perims, 40 % gyroid.
|
||
module anchor_cradle() {
|
||
outer_l = UWB_L + 2*CRADLE_WALL_T;
|
||
outer_w = UWB_W + CRADLE_FLOOR_T;
|
||
pcb_z = CRADLE_FLOOR_T + STANDOFF_H;
|
||
total_z = pcb_z + UWB_H + 2;
|
||
|
||
difference() {
|
||
union() {
|
||
// ── Cradle body ───────────────────────────────────────────────
|
||
translate([-outer_l/2, 0, 0])
|
||
cube([outer_l, outer_w, total_z]);
|
||
|
||
// ── Front retaining lip ───────────────────────────────────────
|
||
translate([-outer_l/2, outer_w - CRADLE_LIP_T, 0])
|
||
cube([outer_l, CRADLE_LIP_T, CRADLE_LIP_H]);
|
||
|
||
// ── Arm attachment tabs (behind back wall) ─────────────────────
|
||
for (tx = [-ARM_W/4, ARM_W/4])
|
||
translate([tx - 4, -CRADLE_BACK_T, 0])
|
||
cube([8, CRADLE_BACK_T + 1, total_z]);
|
||
}
|
||
|
||
// ── PCB pocket ────────────────────────────────────────────────────
|
||
translate([-UWB_L/2, 0, pcb_z])
|
||
cube([UWB_L, UWB_W + 1, UWB_H + 4]);
|
||
|
||
// ── USB-C exit slot (through back wall, aligned to PCB port) ─────
|
||
translate([0, -CRADLE_BACK_T - e,
|
||
pcb_z + UWB_H/2 - UWB_USBC_H/2])
|
||
cube([UWB_USBC_W + 2, CRADLE_BACK_T + 2*e, UWB_USBC_H + 2],
|
||
center = [true, false, false]);
|
||
|
||
// ── USB-C cable routing groove (outer back wall face) ─────────────
|
||
translate([0, -CRADLE_BACK_T - e, -e])
|
||
cube([USBC_CHAN_W, USBC_CHAN_H, pcb_z + UWB_H/2 + USBC_CHAN_H],
|
||
center = [true, false, false]);
|
||
|
||
// ── Label card slot (insert from below, rear face upper half) ─────
|
||
// Paper/laminate card strip identifying this anchor instance
|
||
translate([0, -CRADLE_BACK_T - e, pcb_z + UWB_H/2])
|
||
cube([LABEL_W, LABEL_T + 0.3, LABEL_H],
|
||
center = [true, false, false]);
|
||
|
||
// ── Antenna keep-out: remove back wall above antenna area ─────────
|
||
translate([0, -e, pcb_z + UWB_H - UWB_ANTENNA_L])
|
||
cube([UWB_L - 4, CRADLE_BACK_T + 2*e, UWB_ANTENNA_L + 4],
|
||
center = [true, false, false]);
|
||
|
||
// ── Arm bolt holes through attachment tabs ────────────────────────
|
||
for (tx = [-ARM_W/4, ARM_W/4])
|
||
translate([tx, ARM_T/2 - CRADLE_BACK_T, total_z/2])
|
||
rotate([-90, 0, 0])
|
||
cylinder(d = M3_D, h = ARM_T + CRADLE_BACK_T + 2*e);
|
||
|
||
// ── Lightening slots in side walls ────────────────────────────────
|
||
for (side_x = [-outer_l/2 - e, outer_l/2 - CRADLE_WALL_T - e])
|
||
translate([side_x, 2, pcb_z + 2])
|
||
cube([CRADLE_WALL_T + 2*e, UWB_W - 4, UWB_H - 4]);
|
||
}
|
||
|
||
// ── M2.5 standoff bosses (positive, inside cradle floor) ──────────────
|
||
for (hx = [-UWB_HOLE_X/2, UWB_HOLE_X/2])
|
||
for (hy = [(outer_w - UWB_W)/2 + (UWB_W - UWB_HOLE_Y)/2,
|
||
(outer_w - UWB_W)/2 + (UWB_W - UWB_HOLE_Y)/2 + UWB_HOLE_Y])
|
||
difference() {
|
||
translate([hx, hy, CRADLE_FLOOR_T - e])
|
||
cylinder(d = STANDOFF_OD, h = STANDOFF_H + e);
|
||
translate([hx, hy, CRADLE_FLOOR_T - 2*e])
|
||
cylinder(d = M2P5_D, h = STANDOFF_H + 4);
|
||
}
|
||
}
|
||
|
||
// ============================================================
|
||
// PART 4 — CABLE CLIP
|
||
// ============================================================
|
||
// Snap-on C-clip retaining USB-C cable along tilt arm outer face.
|
||
// Presses onto ARM_T-wide arm with PETG snap tongues.
|
||
// Open-front cable channel for push-in cable insertion.
|
||
// Print ×2–3 per anchor, spaced 25 mm along arm.
|
||
//
|
||
// Print: clip-opening face down, PETG, 3 perims, 20 % infill.
|
||
module cable_clip() {
|
||
ch_r = CLIP_CABLE_D/2 + CLIP_T;
|
||
snap_t = 1.6;
|
||
|
||
difference() {
|
||
union() {
|
||
// ── Body plate ────────────────────────────────────────────────
|
||
translate([-CLIP_BODY_W/2, 0, 0])
|
||
cube([CLIP_BODY_W, CLIP_T, CLIP_BODY_H]);
|
||
|
||
// ── Cable channel (C-shape, opens toward +Y) ─────────────────
|
||
translate([0, CLIP_T + ch_r, CLIP_BODY_H/2])
|
||
rotate([0, 90, 0])
|
||
difference() {
|
||
cylinder(r = ch_r, h = CLIP_BODY_W, center = true);
|
||
cylinder(r = CLIP_CABLE_D/2,
|
||
h = CLIP_BODY_W + 2*e, center = true);
|
||
// open insertion slot
|
||
translate([0, ch_r + e, 0])
|
||
cube([CLIP_CABLE_D * 0.85,
|
||
ch_r * 2 + 2*e,
|
||
CLIP_BODY_W + 2*e], center = true);
|
||
}
|
||
|
||
// ── Snap tongues (straddle arm, -Y side of body) ─────────────
|
||
for (tx = [-CLIP_BODY_W/2 + 1.5,
|
||
CLIP_BODY_W/2 - 1.5 - snap_t])
|
||
translate([tx, -ARM_T - 1, 0])
|
||
cube([snap_t, ARM_T + 1 + CLIP_T, CLIP_BODY_H]);
|
||
|
||
// ── Snap barbs ────────────────────────────────────────────────
|
||
for (tx = [-CLIP_BODY_W/2 + 1.5,
|
||
CLIP_BODY_W/2 - 1.5 - snap_t])
|
||
translate([tx + snap_t/2, -ARM_T - 1, CLIP_BODY_H/2])
|
||
rotate([0, 90, 0])
|
||
cylinder(d = 2, h = snap_t, center = true);
|
||
}
|
||
|
||
// ── Arm slot (arm body passes between tongues) ─────────────────────
|
||
translate([0, -ARM_T - 1 - e, CLIP_BODY_H/2])
|
||
cube([CLIP_BODY_W - 6, ARM_T + 2, CLIP_BODY_H - 4], center = true);
|
||
}
|
||
}
|