I am.
To cut them I am using a stock 1000mm X-Carve with the 300w 24v spindle and a single flute 1/8" up cut bit. All tool paths are generated by Easel.
You can see the full project here:
https://www.inventables.com/collections/4
And follow along with how I did it here:
https://discuss.inventables.com/t/tip-jar-bounty-500-claimed-by-sketch42-iphone-6-case/9122
Back on the conversation of coasters, I think my next batch of coasters might be something like this:
