These are riser stands for Genji, Mercy, and Zarya. Genji and Zarya are 18mm tall. Mercy is 38mm. They have a recess to fit the clear stand that comes with the Pop. Print upside down, no supports. I print mine with no fill and no top layer. They come out hollow with no bottom. They are plenty durably like that. They should be a fast and easy print.
I'm working on more stands and will be adding them soon. I am adding some generic stands with no cutout to fit pops without the clear circle, and larger pops.