This is just a simple coaster. There's a little bit of a rim around the edge, and across the middle there's a PCB-inspired design. It's wide enough to fit my water bottle, but feel free to scale it however you'd like in order to fit what you want to use it for. The pattern should even be able to withstand being flattened a bit in the Z axis.

I printed this in silky PLA, but if you want to use it for hot drinks please consider using a more heat-resistant material.

I hope you enjoy!