I printed these with the option to add a keychain. The keychain hole was somewhat fiddle to get a 0.35" loop into. You might opt to get a bigger keychain attachment piece, or modify the model slightly. Seemed to me like my jump loops between the keychain and model were a bit small. They were also a pain to install. Model printed great. I even opted to go a step further and color the pawpads pink on all four paws - i know some people who absolutely adore those added features. For a plate of 8 of these it was an almost 13 hour print job, on my P1S, and $3.23, with 66g flushed as waste even with flush into infill turned on -- If I was to print just 1 on a plate, it would be an almost 8 hour print job, on my P1S, at $1.95, with 74g flushed as waste.