Table 2.

Summary of current 3DP techniques suitable for droplet microfluidics.

	FDM	SLA or DLP	Polyjet
Principle	Extrusion	Photocuring	Inkjet
Material	Thermoplastic	Liquid photosensitive resin	Liquid photosensitive resin
Feature resolution	∼100 $\mathsf{\mu }$m	∼25 $\mathsf{\mu }$m	∼14 $\mathsf{\mu }$m
Reported drop size	⪆100 $\mathsf{\mu }$m	⪆50 $\mathsf{\mu }$m	⪆100 $\mathsf{\mu }$m
Advantage	Simple, low-cost and biocompatible	Transparent, smooth surface and high accuracy	Multimaterial, large printable dimension and high accuracy
Disadvantage	less transparent, rough surface and low resolution	Limited material, less biocompatible and limited open-source	Rough surface, less biocompatible and high costs