The miniature-electrolyser-cell (ME-cell) was machined from polyether ether ketone (PEEK). The cell halves sealed onto the edge of the membrane using a PEEK locking ring. The components within the cell were compressed using stainless steel plungers in contact with stainless steel bolts in each cell half. During cell assembly the bolt in each cell half was locked in place so that the available depth inside each cell half was set to the thickness of the porous transport layers (PTLs) using a custom depth gauge. When the cell was sealed with the locking ring, the PTLs were compressed to enable good contact with the CCM while maintaining their porous structure to allow gas and liquid transport. Good contact between the CCM and PTLs was verified by impedance measurement after each cell assembly. The stainless-steel bolts additionally served as the electrical connections for each cell half. Due to the small size of the cell flow fields were not deemed necessary.