Classic 55 piece domino set with a matching box. Colored markings are achieved by changing the filament mid-print - set your slicer settings accordingly. The marking are surrounded by a rim to achieve flat domino tops.
Domino piece proportions are taken from the ideas in this blog post. [archive] The STL file was prepared with the following piece dimensions: 36x18x6mm, scale if needed. Use SCAD source file to customize.
The author remixed this model.
The original work was taken as a starting point, the project is mostly redone.