//============================================================
// Cap for aluminium can 0.25L (small) and 0.33/0.50L (big)
// For big: O-ring 47*4, for small: O-ring 45*4
//============================================================
$fn   = 100;
   ch = 11.0;
   rs = 2;

   dd = 59.90; //Uncomment for small cap
//   dd = 62.25; //Uncomment for big cap
 difference() {
   difference() { 
// -------------------- draw outer cylinder -------------------   
   union () {
     rotate_extrude () {
       translate ([dd/2-rs,rs,0]) circle (rs);
       square ([dd/2-rs,rs]);
     }
     translate ([0,0,rs]) cylinder (d=dd,h=ch-rs);
   }
// -------------------- draw locking slot ---------------------   
     union () {
     translate([0,0,4.5])  cylinder(d=dd-8.85,h=10.0, center=false); 
     translate([0,0,5.4])  cylinder(d=dd-6.6,h=3, center=false); 
     }
//--------------------- draw chamfer --------------------------
     translate([0,0,10.4]) rotate([0,180,0])
       cylinder(d1=dd-10,d2=dd-7,h=3, center=false); 
     translate([0,0,9.1]) rotate([0,0,0])
       cylinder(d1=dd-10,d2=dd-7,h=3, center=false); 
   }
// -------------------- draw incisions ------------------------
      for (a =[-67.5:22.5:90])      
     translate([0,0,8.5]) rotate([a,90,90]) cube( [8,80,1],center=true);  

// ------------------- draw inner cylinder --------------------  
    rotate_extrude() {  
      translate([dd/2 -5.0, 4.50, 8])
      circle(d = 4.1, $fn = 100);
    }      
  }