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Arduino open-source microcontrollers are well known in sensor applications for scientific equipment and for controlling RepRap 3-D printers. Recently low-cost open-source gas metal arc weld (GMAW) RepRap 3-D printers have been developed. The entry-level welders used have minimal controls and therefore lack any real-time measurement of welder voltage or current.

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Scientists have begun using self-replicating rapid prototyper (RepRap) 3-D printers to manufacture open source digital designs of scientific equipment. This approach is refined here to develop a novel instrument capable of performing automated large-area four-point probe measurements. The designs for conversion of a RepRap 3-D printer to a 2-D open source four-point probe (OS4PP) measurement device are detailed for the mechanical and electrical systems. Free and open source software and firmware are developed to operate the tool.