To quickly test your support parameters.
Use it at its minimal size, or enlarge it.

SUGGEST minimum 250% to remove supports with normal size tools (depending on support parameters)

Can also be used to test an interface support layer of another material (e.g. PETG between a PLA object and the supports in the same PLA).
This can work without purge tower, and with minimal filament waste and a limited number of movements. Tested with Orca slicer.