What syncs

In Archicad

In Blender

Wall, slab, roof, column, beam, morph

One mesh per element, named by type and element ID

Opening in a wall or slab

Cut in the mesh, not filled

Door, window

A plain mesh. Not an instance of a shared definition.

Element with several surfaces

One mesh with several material slots

Open (not closed) body

Flagged with a double-sided custom property

Story

A collection, named like "0. Ground Floor"

Element type in a story

A child collection, named like "Ground Floor · Wall"

Layer

A custom property, and a hidden BY LAYER mirror collection

Elements on hidden layers, and elements that are not in the 3D model, are not sent.