To minimize finger movement the author decided to use 16 mm key spacing instead of the standard 19.05 mm.
Another main goal of the project was a design without any supports:
One problem of 3D printed keyboard is it needs many “support” which consumes many filaments, and it’s difficult to remove. I want to print my keyboard without any “support”. Less filament means higher printing speeds and unblock opportunity to have multiple iterations – ikeji.