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 cap used for electrolysis experiments in a 50mL beaker. To be used in conjunction with "electrolysis electrodes" and "beaker divider" We recommend printing this design with ABS filament.