The scope of the present research aims at demonstrating the 3D printing use in the manufacturing of microchannels for chemical process applications. A comparison among digital model processing applications for 3D print (slicers) and a print layer thickness analysis were performed. The 3D print fidelity was verified in several devices

including the microchannels' printing with and without micromixer zones. In order to highlight the 3D print potential in Chemical Engineering

the biodiesel synthesis was also carried out in a millireactor manufactured by 3D printing. The millireactor operated under laminar flow regime with a total flow rate of 75.25 ml·min

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(increment of about 130 times over traditional microdevices used for biodiesel production). The printed millireactor provided a maximum yield of Ethyl Esters of 73.51% at 40℃

ethanol:oil molar ratio of 7 and catalyst concentration of 1.25 wt% and residence time about 10 s. As a result of flow rate increment attained in the millireactor

the number of required units for scaling-up the chemical processes is reduced. Using the approach described in the present research

anyone could produce their own millireactor for chemical process in a simple way w

ith the aid of a 3D printer.