This is a remix of: http://www.thingiverse.com/thing:51350
I wanted to make the key ring hole bigger, but ended up making quite a few variables customizable. You can either use thingiverse Customizer to make your own version or use the openscad source on your computer. The variables should be well commented. There are other options for writing text as well as using other fonts if you want to use the openscad source on your computer. I was not sure how well Thingiverse customizer would work with the fonts & text, but seems to work pretty good in Firefox. It seems to be hit or miss when using IE11.
I printed this in purple PLA with 20% infill and Octagram spiral pattern for top & bottom using slic3r 1.2.9. I really like the way that top & bottom pattern usually comes out. At 2mm Ht, it only takes about 10 to 11 minutes to print one of these.