Abstract: A method is provided. A center of mass of the bat is calculated based at least in part on the physical characteristics, the length, and the drop. A first and second mass distribution for an insert having a central axis and a length is calculated based at least in part on the calculated center of mass. The first mass distribution is symmetric about the central axis along the entire length, and the second mass distribution includes a first density for at least one low mass region and a second density for a high mass region with the second density is greater than the first density. Then, the insert is 3D printing based at least in part on the first and second mass distributions.

Abstract: A method is provided. A session is established with a server by a user, which included generating a symmetric session key, encrypting the symmetric session key with the server's public key to generate an encrypted session key, and transmitting the encrypted session key to the server. A user's physical characteristics are measured, and the user's physical characteristics are formatted into a transmission message. The transmission message is encrypted to generate an encrypted transmission message with the symmetric session key. The encrypted transmission message is transmitted to the server. A receive message is received from the server. The receive message is decrypted with the symmetric session key into a decrypted message, and the decrypted message is formatted into ordered bat data. The ordered bat data is then displayed.