Genetic algorithms were applied to design high altitude balloon capsules. Capsule was printed from PLA in FFF and sent into the stratosphere with biological samples. As predicted cargo was not harmed, energy of the landing was absorbed by energy absorbing structures. To lower the mass of the capsule and mission level of risk every generated design underwent 3000 virtual landings on randomly generated surfaces. First batch of 100 designs was generated semi-randomly, following 99 batches came from averaging alphanumeric strings which contained a full description of designs (one string contained description of one design). Amount of designs in a batch was constant.