This device is used to quickly load barocycler caps into a cap try, such as this (https://www.printables.com/model/171364-storage-tray-for-barocycler-caps), by aligning the caps in the 96 plate format.
The door is fit in place with a piece of 0.75 mm filament.
See this video on how to use the device:
Credit to Angus Dausmann for this design under my supervision as an intern at ProCan CMRI.
The author marked this model as their own original creation.