Fig. (1) Prototype of the FTCA cartridge: Parts labeled are, 1 – insert (2-hole); 2 - cartridge top; 3 – membrane; 4 - absorbent pad; 5 - cartridge bottom; and 6 - enclosure. (A) General schematic of a disposable cartridge with a snap-fit mechanism (marked S); (B) Actual photograph of the 3D printed cartridge parts (1, 2, 5 and 6) and assembly using screws and enclosure.