Here you can see my last design to maintain 4 bowden and the new connector for the sensor and the heater for ultimaker 2+.
I designed this 4 bowden support for the Dual_balance system who works in dual mode but you can also use it in simple mode.
The idea is to soldering together two Double Row Male Breakable Pin Header Connector Strip:
Brand Name: SHWB Model Number: 2.54 Pin Header
This Pin header Connector is not very expensive and useful with many standard 2.54 mm male connector (or Male and female). You can find below a exemple.
And after you can slip this new type of male to male connector inside this 4 bowden support.
You can find here some example of other 3d printing: