I was challenged by a Spartan Race team member to make a 3d printable iTag (see below for description of iTag) for our most recent Spartan Race.

This fits well, and you can easily modify the text to meet your needs. Change the color of the Spartan to match your race.

Printed with Overture PLA with 0.16 layer height.

From Spartan Race web page.

“The SpartanTab is a customized plate which personalizes your hard-earned Spartan Race finisher medal. It is available in a self-adhesive option which fits neatly in to the recess on the reverse side of the medal or in a dog-tag style which attaches via the enclosed ball-chain. The Dog Tag and Self Adhesive options are silver. The Age Group Winner option is bronze.”