Nordic (Easter) tradition egg rolling ramp model. 

Initially made out of wood, but obviously a printed version is way more precise and durable. Optimised angle for a smooth rolling experience, includes a pocket at the top to temporarily store eggs, since you start with a minimum of two eggs.

The traditions include (of course) the boiling of the eggs and painting them, before the challenge. The actual game consists of rolling to hit the eggs  placed downhill from the bottom of the ramp. The participants take turns to roll one egg each.  There are usually a few starter eggs "targets" at the bottom of the slope at the beginning. If your rolling egg does not hit another it stays where it stops rolling, to be a target for your competitors. If your egg hits another egg, you get to retrieve your egg and any others it hit along its path. The one with all the eggs at the end is the winner. have fun!