OctoCoaster - Stackable coaster (no supports)

I wanted a simple coaster that required no supports and took up very little bed space so I can print many in one go so I designed this.

I use these under oil bottles and other messy things in the kitchen.

Print on the thin edge as per the diagram.
I use a brim for adhesion.
You can pack them close together for printing multiple, ensure retraction is enabled to minimize stringing.