The organelle responsible for manufacturing the components of ribosomes is called the nucleolus.
The nucleolus is located within the nucleus of eukaryotic cells and is not surrounded by a membrane. It plays a crucial role in the production of ribosomal RNA (rRNA), which combines with proteins to form ribosomal subunits. These subunits are then transported out of the nucleus into the cytoplasm, where they assemble into functional ribosomes, essential for protein synthesis in the cell. The nucleolus can be seen under a light microscope as a dense, round structure in the nucleus, particularly active in cells that are metabolically active and producing many proteins.