Although the Kayfun V3 ES was a great success, it still left room for improvements. Especially more convenient refilling was a feature, customers kept asking for.
In February 2013 SvoëMesto introduced the Kayfun 3.1 in 3 colors:
alpha: sand and ceramic blasted
beta: sand blasted
All three version were coated with a nano layer of ceramic coating, which then was fused into the upper metal layer under high temperatures. The goal was redefining market standards with a grippy, scratch and fingerprint resistant surface.
Later on, 2 further surfaces were offered: delta (mirror polished) and brushed wihtout a nano layer.
Additionaly, the Kayfun 3.1 offered a new 3 segment tank as well as a fill valve, that enabled the user to fill the tank simply by pressing a certain type of bottle against it and squeeze the liquid in. After filling the valve would automatically close again and seal the pressure system.