Eye rolling smiley coaster (in love)

Print in place. No supports. Use gentle force to brake eyes rotatable after print.

A thickness of 2.5mm seems sufficient to hold the rotating eyes inside the socket.

But strong children will squeeze them out bare-knuckle :) → .( 

Increase the thickness with OpenSCAD to make it more robust.

You can do a manual color change in the middle of printing.

Or - if you own a MMU, use OpenSCAD to render all colored parts. (I didn't try that. Let me know if you've done so)