Summary

This model I made for Laser Sintering process with Metals. The gaps between parts is 0.3mm wide and it probably won't work on an FDM with plastics as the parts will probably stick together, to be tried or scaled up... You can order a metal version here https://www.shapeways.com/product/XJ9MGBPSF/expandable-pentagonal-pendant-keychain?li=search-results-1&optionId=55909186
Cheers!