Core-shell microencapsulation is required for several commercial applications like drug delivery or food processing. Generating near-monodisperse compound particles is essential to attain high efficiency. Current microencapsulation approaches produce particles in great quantities without acceptable control of the size spread or nominal size and viable encapsulation materials are limited. Coaxial electrospray generates precise particle sizes but its inherent low throughput is not commercially sustainable. However, an array of high-density electrospray emitters can greatly increase the throughput without sacrificing size spread. 3D printing makes it possible to create complex multiplexed coaxial electrospray sources at a very low cost.