An attachment for the Oculus Rift to reduce blur associated with your eyes not being lined up with the lenses; a problem for individuals whose Interpupillary distance (IPD) are wider or more narrow than the average 64mm.
Specifically for 60mm IPDs. Also suitable for those with less than 60mm. See main page for further details (http://www.shapeways.com/shops/vrgear).Instuctions and Tips - There are a few things to do to ensure you don't damage anything and things you need to know like which lenses to use and when not to use the IPD config tool. Find those instructions here.