--- /dev/null
+infty = 300;
+eps = 0.01;
+
+base_w = 30;
+base_l = 150;
+
+tip_r = 25;
+tip_rv = 25;
+tip_rv_off = base_l/2-2;
+wall = 1.25;
+
+axle_hole = 3;
+axle_h = 7;
+axle_off = base_l/6;
+axle_cube = 10;
+
+module body() {
+ // base
+ translate([-base_l/2, 0 ])
+ cube([base_l, wall, base_w]);
+
+ // tip
+ intersection() {
+ // the main tube
+ difference() {
+ translate([base_l/2, tip_r, 0])
+ cylinder(r = tip_r, h = base_w, $fn = 128);
+ translate([base_l/2, tip_r, -eps])
+ cylinder(r = tip_r - wall, h = base_w+2*eps, $fn = 128);
+ }
+ // the appropriate quarter of the tube only
+ translate([base_l/2, -eps, -eps])
+ cube([tip_r + eps, tip_r + eps, base_w+2*eps]);
+ // make the tip round
+ translate([tip_rv_off, -eps, base_w/2-eps])
+ rotate([-90, 0, 0])
+ cylinder(r = tip_rv, h = base_w + 2*eps);
+ }
+
+ // axle block
+ difference() {
+ translate([axle_off - axle_cube/2, wall, 0])
+ cube([axle_cube, axle_cube/2 + axle_h, axle_cube]);
+ translate([axle_off, axle_h + wall, -eps])
+ cylinder(r = axle_hole/2, h = axle_cube + 2*eps);
+ }
+}
+
+// left and right part
+for (i = [-1, 1]) scale([1, i, 1])
+ translate([0, axle_h, 0])
+ body();
+