The stack and pips are nice solutions.

The rotation rotFromTo(a,b) is the rotation with minimum angle that maps
the direction of vector a to the direction of vector b. It can be coded
in many ways. As a function returning a 4x4 matrix, it can be found in the
Tips&Tricks
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Tips_and_Tricks#Minimum_rotation_problem
page
of the OpenSCAD Manual. As a module, I like the following:

module rotFromTo(di,do) {
if( norm(di) < 1e-16 || norm(do) < 1e-16 ||
norm(do/norm(do)+di/norm(di))<1e-16 )
children();
else
mirror(do/norm(do)+di/norm(di)) mirror(di) children();
}

Found a nice way to calculate your flattened diamond, which I understand is
the primitive you are going to print:

module flattened_diamond(){

p = [v[0], v[6], v[18], v[8], v[20], [0,0,0]];  // add origin
intersection()
{
scale(1.5) hull() polyhedron(p, [[0,1,2,3,4, 5]]);
diamond();
}
}

--
Sent from: http://forum.openscad.org/

Ups, sorry, I just read that Ronaldo came up with the same approach ...

--
Sent from: http://forum.openscad.org/