My water elemental from Nolzur's had a base, but I didn't like the basic black base so I designed a water base with water splashing all around. Then I decided since I was doing a water base for 25mm, I might as well design a fire base.
The water elemental is not included in this design. It was just provided as an example of how these bases can be used.
Another use for these is that the miniature that is on fire or being hit by water can have these bases placed under them to reflect that elemental damage. The bases are meant to be tight so that there is a squeeze fit so if you are going to use these as temporary bases you many want to increase the size by 10 percent before printing.

PowerSpec

Ultra 3D

Doesn't Matter

No

0.15

15%