RF coils are used to excite and receive the signal in Magnetic Resonance Imaging (MRI). The implementation of high density arrays, composed of up to 128 elements, is a recent development. Elements are decoupled so that there is no significant signal or noise transfer. Development of a quantitative model of capacitive coupling, which plays an important role in coupling at higher frequencies, resulted in a new method of completely removing the coupling between adjacent coils. This method may prove to have important benefits in improving the efficiency in transmit coils and high density and high frequency arrays where capacitive coupling is especially important. The construction of large arrays is also a time consuming task. With the advent of 3D printing the production of many complicated structures has become simplified and easily scalable. The production of coils elements in a transmit array by 3D printing techniques is being investigated with a focus on the eventual production of complete high density arrays with minimal manual labour or time commitment.