heater-base.scad

   1 // 18650 is ~18mm diameter, ~65mm length,
   2 batt_diam = 18;
   3 batt_len = 65+1;
   4 batt_clip_h = 0.75 * batt_diam;
   5 wall = 2.2;
   6
   7 eps = 0.01;
   8 infty = 300;
   9
  10 pcb_len = 36;
  11 pcb_thick = 1.3;
  12 pcb_groove = 2;
  13 pcb_width = 11;
  14 pcb_clip_off = 5;
  15 pcb_clip_w = 8;
  16
  17 wire_thick = 2;
  18 wire_sep = 3;
  19
  20 translate([0, -batt_diam/2-wall-pcb_thick/2+eps, 0])
  21 difference() {
  22         union() {
  23                 // lower part of the PCB holder
  24                 translate([0, 0, (pcb_groove + wall) / 2])
  25                         cube([pcb_len + 2*wall, pcb_thick + 2*wall, pcb_groove + wall], center=true);
  26                 // rear part of the PCB holder (behind S1)
  27                 translate([pcb_clip_off, 0, 0])
  28                         cube([pcb_clip_w, pcb_thick/2+wall/2, pcb_width + 2*wall]);
  29                 // side part of the PCB holder (near the battery wires)
  30                 translate([-pcb_len/2-wall, -pcb_thick/2-wall, 0])
  31                         cube([pcb_groove+wall, pcb_thick+1.5*wall, pcb_width + 2*wall]);
  32         };
  33         // the PCB itself
  34         translate([0, 0, wall + pcb_width/2])
  35                 cube([pcb_len, pcb_thick, pcb_width+eps], center=true);
  36 };
  37
  38 difference() {
  39         union() {
  40                 // lower part of the battery holder
  41                 translate([0, 0, pcb_groove/2 + wall/2])
  42                         cube([batt_len + 2*wall, batt_diam + 2*wall, pcb_groove + wall],
  43                         center=true);
  44                 // rear part of the battery clip
  45                 translate([-(batt_len/2-pcb_len/2+pcb_groove+wall)/2-pcb_len/2+pcb_groove, 0, batt_clip_h/2+wall/2])
  46                         cube([batt_len/2-pcb_len/2+pcb_groove + wall, batt_diam + 2*wall, batt_clip_h + wall], center=true);
  47                 // front (+) part of the battery clip
  48                 translate([batt_len/2+wall/2, 0, batt_clip_h/2+wall/2])
  49                         hull() {
  50                                 cube([wall, batt_diam + 2*wall, batt_clip_h + wall], center=true);
  51                                 translate([-10/2, 0, -batt_clip_h/2])
  52                                 cube([10, batt_diam+2*wall, wall], center=true);
  53                         };
  54                 // middle clips
  55                 translate([pcb_clip_off+pcb_clip_w/2, 0, batt_clip_h/2+wall/2])
  56                         hull() {
  57                                 cube([pcb_clip_w, batt_diam + 2*wall, batt_clip_h + wall], center=true);
  58                                 translate([0, 0, -batt_clip_h/2])
  59                                 cube([2*pcb_clip_w, batt_diam+2*wall, wall], center=true);
  60                         };
  61         };
  62         // battery
  63         translate([-batt_len/2, 0, batt_diam/2+wall])
  64                 rotate([0, 90, 0])
  65                 cylinder(r=batt_diam/2, h = batt_len);
  66         // top part rounded
  67         difference() {
  68                 translate([0, 0, infty/4 + wall + batt_diam/2])
  69                         cube([infty/2, infty/2, infty/2], center=true);
  70                 translate([-infty/2, 0, batt_diam/2+wall])
  71                         rotate([0, 90, 0])
  72                         cylinder(r=batt_diam/2+wall, h = infty);
  73         };
  74         // wire holes
  75         for (j=[-wire_sep/2, wire_sep/2])
  76         for (i=[-wire_sep/2, wire_sep/2])
  77         translate([-infty/2, i, batt_diam/2 + wall+j])
  78                 rotate([0, 90, 0])
  79                 rotate([0, 0, 90])
  80                 cylinder(r=wire_thick/2, h = infty, $fn=6);
  81
  82         translate([-infty/2, -batt_diam/2, wall + pcb_groove + wire_thick/2])
  83                 rotate([0, 90, 0])
  84                 rotate([0, 0, 90])
  85                 cylinder(r=wire_thick/2, h = infty, $fn=6);
  86 };
  87