epaper_door_case/cpu_case.scad

// ============================================================
//  XIAO ePaper Display Board EE04 — 3D-Printed Case (base only)
//  OpenSCAD parametric model
// ============================================================
include <params.scad>
use <ee04.scad>

/* [Preview] */
SHOW_BOARD   = true;
SHOW_BATTERY = true;

// ============================================================
//  HELPERS
// ============================================================

// Standoff boss: screw variant has through-hole; stud variant has locating pin instead.
// Diagonal (X1,Y1)+(X2,Y2) → studs; (X1,Y2)+(X2,Y1) → screws.
module pcb_boss(px, py, stud=false) {
  translate([PCB_OX + px, PCB_OY + py, FLOOR]) {
    difference() {
      cylinder(d=BOSS_D, h=BOSS_H + 0.01, $fn=24);
      if (!stud)
        translate([0, 0, -0.1])
          cylinder(d=SCREW_PILOT_D, h=BOSS_H + 0.2, $fn=18);
    }
    if (stud)
      translate([0, 0, BOSS_H]) {
        cylinder(r=STUD_R, h=STUD_H, $fn=24);
        translate([0, 0, STUD_H])
          sphere(r=STUD_R, $fn=24);
      }
  }
}

// ============================================================
//  BASE
// ============================================================
module base() {
  color("#004B49") {
    difference() {
      rounded_box(OUT_L, OUT_W, BASE_H, CORNER_R);

      // Interior cavity (open top)
      translate([WALL, WALL, FLOOR])
        cube([CAV_L, CAV_W, BASE_H]);

      // ---- +Y wall cutouts ----

      // Sliding power switch pocket — closed exterior face, interior clearance only
      translate([PCB_OX + PWR_CX - PWR_W/2,
                 OUT_W - WALL - 0.1,
                 PCB_Z + PWR_CZ - PWR_H/2])
        cube([PWR_W, WALL - PWR_COVER_T + 0.1, PWR_H]);

      // USB-C slot
      translate([PCB_OX + USBC_CX - (USBC_W + 2*USBC_CBL_CLEAR)/2,
                 OUT_W - WALL - 0.1,
                 PCB_Z + USBC_CZ - (USBC_H + 2*USBC_CBL_CLEAR)/2])
        cube([USBC_W + 2*USBC_CBL_CLEAR, WALL + 0.2, USBC_H + 2*USBC_CBL_CLEAR]);

      // 4× button holes (3 user + 1 reset)
      for (bcx = BTN_CX)
        translate([PCB_OX + bcx,
                   OUT_W + 0.1,
                   PCB_Z + BTN_CZ])
          rotate([90, 0, 0])
            cylinder(d=BTN_D, h=WALL + 0.3, $fn=32);

      // ---- Y- wall step for lid flange clearance ----
      // Remove the full Y- wall above z=BASE_H-FLANGE_H-SLIDE_CLEAR so the lid
      // flanges can enter freely from Y-.
      translate([-0.1, -0.1, BASE_H - LIP_H - SLIDE_CLEAR])
        cube([OUT_L + 0.2, WALL + 0.2, LIP_H + SLIDE_CLEAR + 0.1]);
    }

    // Standoff bosses (added outside diff so cavity doesn't subtract them)
    pcb_boss(PCB_BOSS_X1, PCB_BOSS_Y1, stud=true);   // stud diagonal
    pcb_boss(PCB_BOSS_X2, PCB_BOSS_Y2, stud=true);   // stud diagonal
    pcb_boss(PCB_BOSS_X1, PCB_BOSS_Y2, stud=false);  // screw diagonal
    pcb_boss(PCB_BOSS_X2, PCB_BOSS_Y1, stud=false);  // screw diagonal
  }

  // Lid-retention flanges — right triangles, wide face flush with case top (z=BASE_H),
  // tip pointing down to (WALL, BASE_H-FLANGE_H). Hypotenuse faces down-into-cavity;
  // lid flanges slide underneath it for Z retention.
  color("#2C3863") {
    hull() {
      translate([WALL, WALL, BASE_H - 0.01])
        cube([FLANGE_W, CAV_W, 0.01]);
      translate([WALL, WALL, BASE_H - FLANGE_H])
        cube([0.01, CAV_W, 0.01]);
    }
    hull() {
      translate([OUT_L - WALL - FLANGE_W, WALL, BASE_H - 0.01])
        cube([FLANGE_W, CAV_W, 0.01]);
      translate([OUT_L - WALL - 0.01, WALL, BASE_H - FLANGE_H])
        cube([0.01, CAV_W, 0.01]);
    }
    // Y+ locking flanges — same angled profile as side flanges, in YZ plane;
    // split around FPC notch for cable clearance
    for (seg = [
      [WALL,                             PCB_OX + FPC_CX - FPC_NOTCH_W/2 - WALL],
      [PCB_OX + FPC_CX + FPC_NOTCH_W/2, OUT_L - WALL - (PCB_OX + FPC_CX + FPC_NOTCH_W/2)]
    ])
      hull() {
        translate([seg[0], OUT_W - WALL - FLANGE_W, BASE_H - 0.01])
          cube([seg[1], FLANGE_W, 0.01]);
        translate([seg[0], OUT_W - WALL - 0.01, BASE_H - FLANGE_H])
          cube([seg[1], 0.01, 0.01]);
      }
  }
}

// ============================================================
//  PREVIEW-ONLY COMPONENTS
// ============================================================
module stl_board() {
  translate([PCB_OX, PCB_OY, PCB_Z])
    EE04();
}

module battery() {
  color("darkgray", 0.85)
    translate([CAV_L - BATT_W - CLR_BATX,
               CAV_W - BATT_D - CLR_BATY,
               FLOOR + 0.01])
      cube([BATT_W, BATT_D, BATT_T]);
}

// ============================================================
//  RENDER
// ============================================================
base();

if ($preview) {
  if (SHOW_BOARD)   stl_board();
  if (SHOW_BATTERY) battery();
}