Here are four Rocket League coasters I designed in Rhino 3D and Grasshopper.

The 04_Grand_Champ file is the only model I printed face up, the rest I printed face down on a glass bed in order to print in as much detail as possible. The 02_Rocket_League_Logo file could also be printed face up to prevent the stringing lines I got on my print as you can see the line texture under the blue.

Side note: Coasters with large gaps like the Rocket league Logo in blue make drinks tilt if set just right, but I have yet to have a drink spill! Also be careful of using these coasters for hot beverages if you are printing in PLA, as drinks like hot coffee will most likely warp the plastic.

Cheers, Sean