As mentionned in Ultimate Nespresso Vertuo Capsules Tower comments, it is not possible to stack multible towers to make a taller one, It is specially true for the A1 mini that can print only a 3 capsules height tower.

I made a 'coupler, that let you stack any tower you want to create the height you want !

To stay in the ‘spirit’ of a cheap model, it uses vase mode and requires only a few grams of filament.

I also include a jig to get a perfect alignment.

Print and glue towers, like in the pictures.

Enjoy!