Three linked trefoils

Revised 15/5/17

An OpenSCAD version of dennedesigns http://www.thingiverse.com/thing:1448630

The base OpenSCAD code is generated by my knot generator
http://kitwallace.co.uk/3d/knot.xq

using the fourier function but replacing the last lines with

path = Paths[0];
knot= path_knot(path,R,Sides,Kscale);
d=2.5;
r=30; // configuration 1
// r=90; // configuration 2
echo(r);
for (k=[0:2]) {
scale(Scale)
color(colours[k])