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For what it is worth, i printed the coasters and the platform, my thoughts are as follow.

Coasters need to be scaled for two reasons,
1.) There are not enough layers to form a solid bottom for the center of the coaster if printed at 1:1 scale.
2.) There is excess space in the platform if printing 4 coasters. (The model depicts it but i didnt pay much attention to it before printing)
To address this issue i changed the scale of the coaster by 1.9 on the Z axis only. Make sure you do not have the relationship locked or the coaster will end up being too large in diameter to fit in the platform

The platform would be better if printed in one piece rather than the multi-piece design.

Overall a good design. The symbols are less defined than I would like but I am not sure how to make them more defined.

@ Truford, how did you create the coasters with all the symbols? Did you convert an image to a 3d file or did you render this from scratch? Ill post a made link so you can see what i came up with.