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@@ -46,6 +46,10 @@ SCREW_D = 3.2; // M3 tap drill diameter
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BOSS_D = 6.0; // PCB standoff boss outer diameter
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BOSS_H = 2.0; // standoff boss height; PCB bottom sits flush on boss top
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+/* [Locating Studs] */
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+STUD_CLEAR = 0.10; // radial clearance per side — close (non-interference) fit in SLA resin
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+STUD_H = PCB_T + 1.0; // stud height above boss top: through PCB + 1 mm proud
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+
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/* [PCB Standoff Positions — relative to PCB origin] */
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PCB_BOSS_X1 = 2.5;
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PCB_BOSS_X2 = PCB_L - 2.5;
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@@ -92,14 +96,20 @@ module rounded_box(l, w, h, r) {
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translate([dx, dy, 0]) cylinder(r=r, h=h, $fn=32);
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}
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-// Standoff boss: solid cylinder with through-hole (hole continues into floor via base diff)
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-module pcb_boss(px, py) {
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- translate([PCB_OX + px, PCB_OY + py, FLOOR])
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+// Standoff boss: screw variant has through-hole; stud variant has locating pin instead.
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+// Diagonal (X1,Y1)+(X2,Y2) → studs; (X1,Y2)+(X2,Y1) → screws.
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+module pcb_boss(px, py, stud=false) {
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+ translate([PCB_OX + px, PCB_OY + py, FLOOR]) {
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difference() {
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cylinder(d=BOSS_D, h=BOSS_H + 0.01, $fn=24);
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- translate([0, 0, -0.1])
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- cylinder(d=SCREW_D * 0.7, h=BOSS_H + 0.2, $fn=18);
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+ if (!stud)
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+ translate([0, 0, -0.1])
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+ cylinder(d=SCREW_D * 0.7, h=BOSS_H + 0.2, $fn=18);
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}
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+ if (stud)
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+ translate([0, 0, BOSS_H])
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+ cylinder(d=SCREW_D - 2*STUD_CLEAR, h=STUD_H, $fn=24);
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+ }
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}
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// ============================================================
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@@ -114,11 +124,10 @@ module base() {
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translate([WALL, WALL, FLOOR])
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cube([CAV_L, CAV_W, BASE_H]);
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- // ---- Boss screw holes through 50 % of floor ----
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- for (bx = [PCB_BOSS_X1, PCB_BOSS_X2])
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- for (by = [PCB_BOSS_Y1, PCB_BOSS_Y2])
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- translate([PCB_OX + bx, PCB_OY + by, FLOOR * 0.5 - 0.1])
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- cylinder(d=SCREW_D * 0.7, h=FLOOR * 0.5 + 0.2, $fn=18);
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+ // ---- Boss screw holes through 50 % of floor (screw diagonal only) ----
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+ for (pos = [[PCB_BOSS_X1, PCB_BOSS_Y2], [PCB_BOSS_X2, PCB_BOSS_Y1]])
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+ translate([PCB_OX + pos[0], PCB_OY + pos[1], FLOOR * 0.5 - 0.1])
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+ cylinder(d=SCREW_D * 0.7, h=FLOOR * 0.5 + 0.2, $fn=18);
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// ---- +Y wall cutouts ----
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@@ -150,10 +159,10 @@ module base() {
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}
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// Standoff bosses (added outside diff so cavity doesn't subtract them)
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- pcb_boss(PCB_BOSS_X1, PCB_BOSS_Y1);
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- pcb_boss(PCB_BOSS_X2, PCB_BOSS_Y1);
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- pcb_boss(PCB_BOSS_X1, PCB_BOSS_Y2);
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- pcb_boss(PCB_BOSS_X2, PCB_BOSS_Y2);
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+ pcb_boss(PCB_BOSS_X1, PCB_BOSS_Y1, stud=true); // stud diagonal
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+ pcb_boss(PCB_BOSS_X2, PCB_BOSS_Y2, stud=true); // stud diagonal
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+ pcb_boss(PCB_BOSS_X1, PCB_BOSS_Y2, stud=false); // screw diagonal
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+ pcb_boss(PCB_BOSS_X2, PCB_BOSS_Y1, stud=false); // screw diagonal
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}
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// Lid-retention flanges — right triangles, wide face flush with case top (z=BASE_H),
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