Just a handy spot to clip one of the nozzles to the vacuum's tube.  The wall mount only holds 2 of the three provided attachments so I just keep one on the vac.

Prints fine without supports.

The nozzle attachment is pretty specific to this brand, so it won't work as is on other vacuums, but should be a pretty easy remix.  I may may a generic one for shop vacs.

https://www.printables.com/model/1151122-bissel-cleanview-xr-wall-mount-attachments-holder is another option to replace the two 2 holder on the wall mount with one that holds 3 tools.  I often switch between the power head and the crevice tools, so having it onboard works best for me.