You can find the BOM (Bill of Materials) of the non-printable parts in the Onshape document under this link: https://cad.onshape.com/documents/775cd57fa655e34e0a8b6d93/v/1e5e359d98efa05f20b5d017/e/2469ee3a35b80be2cc7edd03?configuration=List_aCUFOUvhQWqNY0%3DNew_Body%3BPrint_helpers%3Dfalse%3BShow_electronics%3Dtrue%3BShow_metal_parts%3Dtrue%3BShow_wiring_and_tubes%3Dtrue&bomType=flattened&renderMode=0&rightPanel=BOMPanel&uiState=688323af941abc5bc5ca396f
This link makes sure that the options “Show metal parts” and “Show electronics” are active.
