Hi Aaron,
From what I can see in the Part Generator, in tab "Entity type", your entities are typed with the bus definition "Part" alone. So your entities only have the elements Nf, Nj and crackLength. If you expected your entities to also have the elements of the other buses stored in your matfile, you should define a new envelop bus that contains all the other buses as sub-elements, like the bus "Main" in the screenshot below:
From there, in the Part Generator block, you'd select the entity type "Main".
Hope it helps
