#!/usr/bin/env python3 """ CYD climate case — clean clamshell. - Front: screen bezel + male lip - Back: cavity + female groove + DHT11 snap pocket flush in back wall (tip proud ~1.6mm) - No side “boxes”: removed bulky stand block and external DHT hang-on bay """ from __future__ import annotations from pathlib import Path import trimesh from trimesh.creation import box, cylinder PCB_L, PCB_W = 86.0, 50.0 MH_INSET = 4.0 DISP_X, DISP_L, DISP_W, DISP_H = 8.0, 69.0, 50.0, 4.0 VIEW_L, VIEW_W, VIEW_IX, VIEW_IY = 59.5, 45.0, 7.0, 2.5 WALL, GAP = 2.4, 0.35 BEZEL_T = 2.2 CAVITY = 8.0 LIP_H, LIP_CLEAR = 2.2, 0.2 USB_W, USB_H, USB_Y = 15.0, 9.0, 30.5 SCREW, BOSS_OD, BOSS_ID = 3.3, 7.0, 2.5 # DHT11 module pocket (from OUTSIDE of back face z=0) DHT_L, DHT_W, DHT_H = 16.0, 12.5, 7.5 DHT_PROUD = 1.6 INNER_L = PCB_L + 2 * GAP INNER_W = PCB_W + 2 * GAP OUTER_L = INNER_L + 2 * WALL OUTER_W = INNER_W + 2 * WALL SKIRT = DISP_H + 1.0 # Back total height to mating plane (top of female groove floor) BACK_BODY_H = WALL + CAVITY # rim starts here FRONT_BODY_H = BEZEL_T + SKIRT MH = [ (MH_INSET, MH_INSET), (PCB_L - MH_INSET, MH_INSET), (PCB_L - MH_INSET, PCB_W - MH_INSET), (MH_INSET, PCB_W - MH_INSET), ] def aabb(x0, y0, z0, x1, y1, z1) -> trimesh.Trimesh: xa, xb = sorted((float(x0), float(x1))) ya, yb = sorted((float(y0), float(y1))) za, zb = sorted((float(z0), float(z1))) dx, dy, dz = xb - xa, yb - ya, zb - za if min(dx, dy, dz) < 1e-6: raise ValueError(f"degenerate {[xa, ya, za, xb, yb, zb]}") m = box(extents=[dx, dy, dz]) m.apply_translation([xa + dx / 2, ya + dy / 2, za + dz / 2]) return m def U(*ms: trimesh.Trimesh) -> trimesh.Trimesh: r = ms[0] for m in ms[1:]: r = r.union(m, engine="manifold") return r def D(a: trimesh.Trimesh, *ss: trimesh.Trimesh) -> trimesh.Trimesh: r = a for s in ss: r = r.difference(s, engine="manifold") return r def make_front() -> trimesh.Trimesh: """ Z=0: outer screen face Z=FRONT_BODY_H: open rim with male lip extending to FRONT_BODY_H+LIP_H """ body = aabb(0, 0, 0, OUTER_L, OUTER_W, FRONT_BODY_H) hollow = aabb(WALL, WALL, BEZEL_T, OUTER_L - WALL, OUTER_W - WALL, FRONT_BODY_H + 1) vx = WALL + GAP + DISP_X + VIEW_IX vy = WALL + GAP + VIEW_IY view = aabb(vx - 0.2, vy - 0.2, -0.5, vx + VIEW_L + 0.2, vy + VIEW_W + 0.2, BEZEL_T + 0.5) sx = WALL + GAP + DISP_X - 0.2 pocket = aabb( sx, WALL + GAP - 0.1, BEZEL_T - 0.05, sx + DISP_L + 0.4, WALL + GAP + DISP_W + 0.1, BEZEL_T + DISP_H + 0.6, ) out = D(body, hollow, view, pocket) # male lip: thin wall ring protruding past rim lip_out = aabb( WALL - 1.0, WALL - 1.0, FRONT_BODY_H - 0.05, OUTER_L - (WALL - 1.0), OUTER_W - (WALL - 1.0), FRONT_BODY_H + LIP_H, ) lip_in = aabb( WALL + LIP_CLEAR, WALL + LIP_CLEAR, FRONT_BODY_H - 0.2, OUTER_L - WALL - LIP_CLEAR, OUTER_W - WALL - LIP_CLEAR, FRONT_BODY_H + LIP_H + 0.5, ) out = U(out, D(lip_out, lip_in)) for px, py in MH: hole = cylinder(radius=SCREW / 2 + 0.1, height=FRONT_BODY_H + LIP_H + 4, sections=28) hole.apply_translation([WALL + GAP + px, WALL + GAP + py, FRONT_BODY_H / 2]) out = D(out, hole) out.merge_vertices() return out def make_back() -> trimesh.Trimesh: """ Z=0: exterior back face (DHT grill here, slightly proud) Z=BACK_BODY_H: mating plane; female groove from BACK_BODY_H to BACK_BODY_H+LIP_H """ total_h = BACK_BODY_H + LIP_H body = aabb(0, 0, 0, OUTER_L, OUTER_W, total_h) cavity = aabb(WALL, WALL, WALL, OUTER_L - WALL, OUTER_W - WALL, total_h + 1) out = D(body, cavity) # female groove: cut a channel in the top rim for the male lip # outer wall of groove groove = aabb( WALL - 1.0 - LIP_CLEAR, WALL - 1.0 - LIP_CLEAR, BACK_BODY_H + 0.1, OUTER_L - (WALL - 1.0 - LIP_CLEAR), OUTER_W - (WALL - 1.0 - LIP_CLEAR), total_h + 0.2, ) groove_keep = aabb( WALL + 0.05, WALL + 0.05, BACK_BODY_H - 0.1, OUTER_L - WALL - 0.05, OUTER_W - WALL - 0.05, total_h + 0.3, ) out = D(out, D(groove, groove_keep)) # USB uy0 = WALL + GAP + USB_Y - USB_W / 2 out = D(out, aabb(-0.5, uy0, WALL + 1.0, WALL + 1.0, uy0 + USB_W, WALL + 1.0 + USB_H)) # button holes for y in (12.0, 22.0): btn = cylinder(radius=2.2, height=WALL + 2, sections=20) btn.apply_translation([WALL + GAP + 10, WALL + GAP + y, WALL / 2]) out = D(out, btn) # screw bosses bosses = [] for px, py in MH: x, y = WALL + GAP + px, WALL + GAP + py boss = cylinder(radius=BOSS_OD / 2, height=CAVITY - 0.5, sections=28) boss.apply_translation([x, y, WALL + (CAVITY - 0.5) / 2]) hole = cylinder(radius=BOSS_ID / 2, height=CAVITY + 1, sections=20) hole.apply_translation([x, y, WALL + CAVITY / 2]) bosses.append(D(boss, hole)) out = U(out, *bosses) # ---- DHT11 flush pocket in back wall (NOT a side box) ---- # Center on back face cx = OUTER_L * 0.5 cy = OUTER_W * 0.5 # Pocket carved from outside into wall+cavity enough for module pocket = aabb( cx - DHT_L / 2 - 0.3, cy - DHT_W / 2 - 0.3, -0.05, cx + DHT_L / 2 + 0.3, cy + DHT_W / 2 + 0.3, WALL + DHT_H - 1.0, ) out = D(out, pocket) # Snap rails (卡位) left/right inside pocket — thin ledges rail_z0, rail_z1 = 1.2, 1.2 + 2.2 left = aabb(cx - DHT_L / 2 - 0.3, cy - 3.2, rail_z0, cx - DHT_L / 2 + 1.0, cy + 3.2, rail_z1) right = aabb(cx + DHT_L / 2 - 1.0, cy - 3.2, rail_z0, cx + DHT_L / 2 + 0.3, cy + 3.2, rail_z1) # bottom stop (prevents falling inward) stop = aabb(cx - 5, cy - DHT_W / 2 + 0.5, WALL + DHT_H - 2.2, cx + 5, cy + DHT_W / 2 - 0.5, WALL + DHT_H - 1.0) out = U(out, left, right, stop) # Proud grill ring on exterior (the only intentional protrusion) grill_ring = aabb( cx - DHT_L / 2 - 1.0, cy - DHT_W / 2 - 1.0, -DHT_PROUD, cx + DHT_L / 2 + 1.0, cy + DHT_W / 2 + 1.0, 0.05, ) grill_hole = aabb( cx - DHT_L / 2 + 1.5, cy - DHT_W / 2 + 1.5, -DHT_PROUD - 0.2, cx + DHT_L / 2 - 1.5, cy + DHT_W / 2 - 1.5, 0.2, ) # slot vents in proud face slots = [] for i in range(4): slots.append(aabb( cx - 5 + i * 2.8, cy - 4.5, -DHT_PROUD - 0.2, cx - 5 + i * 2.8 + 1.2, cy + 4.5, 0.2, )) out = U(out, D(grill_ring, grill_hole, *slots)) # tiny wire path already open via pocket into cavity # Simple thin kickstand rib (not a hollow “格子”) — optional small triangle # Skip bulky stand entirely per user feedback. out.merge_vertices() return out def main() -> None: out = Path(__file__).resolve().parent / "export" out.mkdir(parents=True, exist_ok=True) print("front…") front = make_front() print("back…") back = make_back() front.export(out / "front.stl") back.export(out / "back.stl") # write mate info for viewer meta = out / "mate.json" meta.write_text( "{\n" f' "outer_l": {OUTER_L},\n' f' "outer_w": {OUTER_W},\n' f' "front_body_h": {FRONT_BODY_H},\n' f' "back_body_h": {BACK_BODY_H},\n' f' "lip_h": {LIP_H},\n' f' "dht_proud": {DHT_PROUD}\n' "}\n", encoding="utf-8", ) print(f"front {front.extents} watertight={front.is_watertight}") print(f"back {back.extents} watertight={back.is_watertight}") print("closed stack height ≈", BACK_BODY_H + FRONT_BODY_H, "mm (lips nest, not add full)") print("Wrote STLs + mate.json") if __name__ == "__main__": main()