After much searching I saw articles written about using two modifiers: Wireframe and SubDiv.
I thought this was the greatest thing from the pictures. However I've spent some time creating rows of cubes. Eventually getting to the process of scaling a unit cube x times, inserting x-1 loop cuts, going inside this mesh and placing faces internally to create x cubes. Upon applying the modifiers the internal corners, let's say of a 2 x 4 matrix of these cubes, are not rounded like the exterior corners.
I'm developing a product and if printed as a solid... would waste a lot of material. But the object is exposed to 5000 - 9000 psi. This prevents normal infill as an option as the part would implode.
My intention was to create either cubic, triangular, or rhombic dodecahedric structures internally and provide small holes to allow the part to equalize. Wireframe + SubDiv is almost there...I just require a vertex joining 8 cubes to have 6 cool looking circular edges... ideally with a larger diameter "ball" at the vertex, then get the 6 edges with 4 distinct lobes.
The latter is weak... and I can't use support material so the use of curved surfaces getting to the right angles generally works well.
Imagine Wireframe + SubDiv on a single cube with a small/no crease weight and the SubD iterations at 4... the internal structure of that cube would be the exterior surface of this lattice I would like to create. To better visualize can add an array modifier to it. Better approximates the goal.
How can I accomplish this?