18650-frame.scad

rows = 10;
cols = 10;
height = 5;
frame_thickness = 2;
cell_radius = 9.5;
wire_radius = 1.5;

module frame() {
     difference() {
          hull() {
               translate([0, 0, 0]) cylinder(height, frame_thickness, frame_thickness, $fn = 4);
               translate([20 * rows, 0, 0]) cylinder(height, frame_thickness, frame_thickness, $fn = 4);
               translate([0, 20 * cols, 0]) cylinder(height, frame_thickness, frame_thickness, $fn = 4);
               translate([20 * rows, 20 * cols, 0]) cylinder(height, frame_thickness, frame_thickness, $fn = 4);
               cube([20 * rows, 20 * cols, height]);
          }

          for (i = [0 : rows - 1]) {
               for (j = [0 : cols - 1]) {
                    translate([10 + i * 20, 10 + j * 20, -5]) cylinder(15, cell_radius, cell_radius, $fn = 40);
               }
          }
     }
}

module limiter() {
     difference() {
          intersection() {
               translate([20, 20, -5]) sphere(14.3, $fn = 20);
               translate([20, 20, 5]) cylinder(wire_radius * 2 + 1, 10, 10, $fn = 4);
          }
          translate([0, 20, (wire_radius * 2) / 2 + 5.3]) rotate([0, 90, 0]) cylinder(40, wire_radius, wire_radius, $fn = 20);
     }
}

difference() {
     frame();

     if (rows > 3 || cols > 3) {
          translate([20, 40, -5]) cylinder(20, 2, 2);
          translate([40, 40, -5]) cylinder(20, 2, 2);

          translate([20, cols * 20 - 40, -5]) cylinder(20, 2, 2);
          translate([40, cols * 20 - 40, -5]) cylinder(20, 2, 2);

          translate([rows * 20 - 20, 40, -5]) cylinder(20, 2, 2);
          translate([rows * 20 - 40, 40, -5]) cylinder(20, 2, 2);

          translate([rows * 20 - 20, cols * 20 - 40, -5]) cylinder(20, 2, 2);
          translate([rows * 20 - 40, cols * 20 - 40, -5]) cylinder(20, 2, 2);
     }
}

for (i = [0 : (rows - 1) / 2]) {
     for (j = [0 : (cols - 1) / 2]) {
          translate([i * 40, j * 40, 0]) limiter();
     }
}