In some embodiments, a method of ensuring fabricability of a segmented design for a physical device to be fabricated by a fabrication system is provided. A proposed segmented design is searched for forbidden patterns in a set of forbidden patterns. Segments from the proposed segmented design that appear in forbidden patterns are added to a set of unfabricable segments. A material indicated by at least one unfabricable segment from the set of unfabricable segments is changed to create an updated segmented design, and the updated segmented design is searched for the forbidden patterns in the set of forbidden patterns. In response to determining that the updated segmented design includes at least one forbidden pattern, the adding, changing, and searching actions are repeated. In response to determining that the updated segmented design does not include any forbidden patterns, an indication is generated that the updated segmented design is fabricable.