This is a sixpack for carrying aroung Commander Deckboxes based on this Design:

MTG Card Deck Box von Ian Smith | Kostenloses STL-Modell herunterladen | Printables.com

I wanted a minimalist way to carry the boxes to gamenight. I am still working on fixing the playmat to the sixpack, so it's an all in one hand design.

It's a very tight fit, so the boxes don't fall out. You could probably print everything a couple % bigger for easier removal. The Ultimate Guard Boulder Boxes are a tiny bit bigger and only fit with raw force.

I printed everything lying down with supports only for the tenons. For the Deck Base it makes a grinding noise/feeling, when putting boxes in and taking them out. You could try printing it lying on the side for a smoother handling, but will need a lot more supports this way.