ok so just asked the question about Kegel drivetrains over here:
which led me to this (I know @JuniorPotato93 was doing for Flywheels so shoulda figured) : http://www.electric-skateboard.builders/t/oranatang-kegel-32-34-36-38-40-42-44-tooth-pulleys-stls-for-9mm-12mm-15mm-belts/7227
So I guess now the question is: does anyone know of good 3D printers in London / UK / EU, who will be able to print these suckers with the right material? No point in doing in the US & shipping - may as well get custom CNC work done for the same price…
Once again, thanks!