There are two versions: stackable and non-stackable. The non-stackable is a bit shorter in z direction, and slightly more elegant. The stackable version is the one you want if you plan to print more than one.
Coaster is large enough for champagne bottles. (If you find a wine or champagne bottle that doesn't fit, let me know and I will provide a larger design.)
Here is a smaller one for glasses: https://makerworld.com/en/models/37717#profileId-36196
XL version, up to 115mm diameter: https://makerworld.com/en/models/448688#profileId-355507
Here are some Voronoi coasters that stack with the spiral coaster: https://makerworld.com/en/models/195914
Please be generous with your likes!
Designed in OpenSCAD w/BOSL2.