I know there are multiple Toronto Maple Leafs coaster here.
I like this one as it's square and I like the simplicity of this style of logo.
This coaster measures 111mm x 111mm.

I designed mine around printing in PETG for added heat resistance of a hot mug - this should be reflected in the print profile, but please change your settings to what works best for you.

Meant to be printed face down. I also used one of the PEO print beds for the funky design on the top, but a textured surface may hide imperfections better.

cheers and enjoy your hot drink.