Keychain stl file generator

Its my version of original desigin https://www.thingiverse.com/thing:101307 of TheNewHobbyist. After few days i have researcher night in my university and i have same problem with TheNewHobbyist, but i want more letters, so i rewrite it and some features for more comfortable work.
Source code located at https://github.com/alexgubanow/keychainGen