It's hard to get that much pressure variation with an aeropress. The plunger is around 5 cm x 5 cm, so the full body weight of a male human (say 90 kg) only giv

It's hard to get that much pressure variation with an aeropress. The plunger is around 5 cm x 5 cm, so the full body weight of a male human (say 90 kg) only gives you 3.5 bar. That's if you're standing on your aeropress. A real espresso machine puts out 9 bar.