Parametric Lens Cap
thingiverse
After discovering the post at http://blog.makerbot.com/2011/03/09/pinhole-lens-for-nikon-by-xjcrawler01-and-a-wee-challenge/, I promptly created these instructions for your convenience: print, cap, and rejoice!
Download Model from thingiverse
With this file you will be able to print Parametric Lens Cap with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Parametric Lens Cap.