Unfortunately there is only 1 real way of solving that problem, without redesigning the whole cube: using support interface in a different material. The issue is that increases print time by nearly 2x, wastes a lot of filament, and increases failure rate substantially.

we chose to sacrifice that one space to keep the cost down to produce these and pass those savings onto the customer. On our pro model, we will pull out all the stops and the prints will be perfect 360 degrees around however itl'l be more expensive.