The general purpose of these designs are described in “Electrolysis Activation of Fused Filament Fabrication 3D Printed Electrodes for Electrochemical and Spectroelectrochemical Analysis”, which is published in the journal Analytical Chemistry. DOI:10.1021/acs.analchem.9b01331 This particular part is a divided electrolysis cell designed to keep the electrolyte separate between the anode and cathode compartments. A small portion of paper towel can be used as a salt bridge between the compartments. We recommend printing this design with ABS filament.