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Source files available at http://www.thingiverse.com/thing:835284 ( or here )

 

Instructions:

Buy one of these: http://www.aliexpress.com/snapshot/6668538728.html 

3D print one of each number (12,3,6,9) and eight tiny bars (use a different colors for them).
2D print and use the PDF as a guide for fixing the pieces with hot/super glue on the vinyl surface.

Done!