epaper_door_case/plunger.scad

// Button plunger for EE04 case +Y wall
// At rest: flange flush with interior face, head proud of exterior face
include <params.scad>

module plunger() {
  color("orange") union() {
    translate([0, -FLANGE_T, 0])
      rotate([-90, 0, 0])
        cylinder(d = PLUNGER_D, h = FLANGE_T + WALL + PLUNGER_HEAD_H, $fn = 32);
    translate([0, -FLANGE_T, 0])
      rotate([-90, 0, 0])
        cylinder(d = FLANGE_D, h = FLANGE_T, $fn = 32);
    translate([0, WALL, 0])
      rotate([-90, 0, 0])
        cylinder(d = PLUNGER_D, h = PLUNGER_HEAD_H, $fn = 32);
  }
}

// ============================================================
//  RENDER — 4x plunger strip with breakaway sprues
//  2 mm gap between flanges; snap the 3 bridges to separate.
// ============================================================

SPRUE_GAP   = 2.0;                       // gap between adjacent flanges
SPRUE_PITCH = FLANGE_D + SPRUE_GAP;     // centre-to-centre
SPRUE_T     = 1.0;                       // bridge thickness — 1.5mm meets resin min
SPRUE_OVL   = 0.2;                       // overlap into each flange edge so shells merge

module plunger_strip() {
  union() {
    for (i = [0:7])
      translate([i * SPRUE_PITCH, 0, FLANGE_T])
        rotate([90, 0, 0])
          plunger();

    // Sprues on flange outer edges — hidden surface, no post-removal cleanup needed
    for (i = [0:6]) {
      x0 = i * SPRUE_PITCH + FLANGE_D / 2 - SPRUE_OVL;
      x1 = (i + 1) * SPRUE_PITCH - FLANGE_D / 2 + SPRUE_OVL;
      translate([x0, -SPRUE_T / 2, FLANGE_T / 2 - SPRUE_T / 2])
        cube([x1 - x0, SPRUE_T, SPRUE_T]);
    }
  }
}

plunger_strip();