Abstract: Systems and methods of clearing clogs in nibs used for vacuum retrieval of dispensable units are described. For example, a system may include a container having a side surface, a base, and a protrusion. To facilitate dislodging debris from the nib, the nib may be positioned into contact with a protrusion in a volume at least partially defined by the side surface and the base. Further, or instead, because the contact between the nib and the protrusion occurs within the volume, the systems and methods of the present disclosure may increase the likelihood of collecting debris that has been removed from the nib.