// -*- C -*-

holedia = 25.4;

sidewidth = 5;
tapewidth = 7;

innerz = 10;

basex = holedia + sidewidth*2;
basey = holedia + tapewidth*2;

bevelz = 3;
bevelslope = 0.75;
bevely = bevelz * bevelslope;

sideslop = 0.5;

basebaset = 2;
basebevelt = 3;

endwallt = 2;

module sheared_cube(sz, xperz, yperz) {
  multmatrix([[1,0,xperz,0],
	      [0,1,yperz,0],
	      [0,0,1,    0],
	      [0,0,0,    1]])
    cube(sz);
}

module Base(){
  difference(){
    union(){
      for (mir=[0,1]) mirror([0,mir,0]) {
	translate([0, basey/2 - basebevelt, 0])
	  sheared_cube([basex, basebevelt, bevelz], 0, bevelslope);
	cube([basex, basey/2, basebaset]);
	rotate([90, 0, 90])
	  linear_extrude(height=endwallt)
	  polygon([[-0.1,             0],
		   [basey/2,          0],
		   [basey/2 + bevely, bevelz],
		   [basey/2 + bevely, innerz],
		   [-0.1,             innerz]]);
      }
    }
    translate([basex/2, 0, -1])
      cylinder(r=holedia/2, h=bevelz+2);
  }
}

module Lid(){
  for (mir=[0,1]) mirror([0,mir,0]) {
    translate([0, basey/2 + sideslop, 0])
      sheared_cube([basex, basebevelt, bevelz], 0, bevelslope);
  }
}

Base();
Lid();