This is a keychain that I designed to go along with a tutorial on my website: constrain3d.wordpress.com. The tutorial explains how to make a keychain just like this using basic modeling skills. You can print this model to show your support for Constrain3d.
For more information about 3d design and CAD, visit my website at https://www.constrain3d.wordpress.com
This model was designed in inches. You may have to set the scale to 2140% if the model appears to be too small in the slicer. This will convert it from millimeters back to inches.