This is a halve grid for gas separation in an electrolysis apparatus. When two (mirrored versions) of these are put together back on back the lamellas form herringbone shapes. This disallows the gasses to pass from one side to the other and mix. . In a concrete application a gas separation wall must be extended upwards and the fluid level must be always kept above the grid. Standalone this thing is incomplete. An electrolysis chamber capable of gas separation is needed in conjunction. It might be a good idea to design the gas splitter top as one piece print with mainly diagonal surfaces to archive maximum gas tightness. . pros & cons: A fitting gas separating chamber needs to be constructed. Good gas seperation geometry: http://hho4free.com/hydrogen_separator_cell.htm ps: Warning! Don't get lost in fringe science crap.