Glass Coaster to keep away table rings.
Tried to make it as large as I could and still make it easily on a Makerbot build platform.
This is sort of an orphaned design cause I created quite a while back but haven't gotten around to refining it.
The Celtic Design would probably print out better if you where using a stepper extruder and could slow down your extrusion for better resolution.
Also should be finished off with an acetone wipe to seal it and make it completely waterproof.
I may get around to improvements in the future if I have the time or inclination.