Printing Spheres

[urglik]

a couple thoughts came to mind.

the inner diameter of the sphere is the target diameter.
so i added twice the wall thickness to the diameter of the first sphere.

also, if a 25mm long neck is placed on top of a 2mm thick sphere
the effective length of the neck will be 27mm. so i tried
subtracting the wall thickness from neck length for the cylinder height.
seems functional.

also, aren't variables actually constants? sorta like constant variables...

// Example: A 220Hz

$fn=100; // fragment number

sd=132.48; // sphere diameter from formula
wt=2; // wall thickness
hd=25; // sound hole diameter
nl=25; // neck length

// Sphere

difference() {
sphere(d=sd+(2*wt)); // create sphere to be hollowed
sphere(d=sd); // hollow the sphere to diameter from formula
translate([0,0,-(sd/2)-wt])cylinder(d=hd,h=wt*2); // create sound hole
}

// Neck

difference() {
translate([0,0,-nl-(sd/2)+wt])cylinder(d=hd+(2*wt),h=nl-wt);
translate([0,0,-nl-(sd/2)+wt])cylinder(d=hd,h=nl-wt);
}

[Roxy]

also, aren't variables actually constants? sorta like constant variables...

yeah if you want to be pedantic they're not what programmers call variables. I call them variables because you can vary them and I'm not a programmer and couldn't give a rats arse what the technical term should or shouldn't be:-)
length of neck would probably be 25mm.

One of the big 'flaws' in OpenScad was the fact symbols could not change value. The current version has addressed this issue. I'm not sure the OpenScad people would call those 'variables', but they are getting pretty close to that now.