Mr Stiffy October 25, 2011 10:26 PM They need to be smooth on the inside. Slowburn October 26, 2011 12:03 AM I can\'t wait until hermit crab conventions have \'The stupidest looking shell contests\'. christopher October 26, 2011 12:10 AM Sammy shuns shotguns shells in search of synthetic sea shell substitutes? seriously? Jason Daiginjo October 26, 2011 12:30 AM Your making shells for hermit crabs out of plastic... AHHHHHH!!!!!!!!!!! Katia Luto October 26, 2011 09:00 AM More exploitation of sentient creatures :( Instead of encouraging the cruel and speciesist \"pet\" industry, PLEASE JUST LEAVE THE CRABS IN THE WILD WHERE THEY BELONG! Facebook User October 26, 2011 12:47 PM I think it\'s a great idea if it works! There\'s many great things you can do with 3Dprinting! @GROWit3D alcalde October 26, 2011 02:51 PM 1. Katia Luto - out on the wild, hermit crabs don\'t have popcorn, and they love popcorn. They also love not being eaten, which also happens a lot more in the wild.2. Forget these printed shells - now I want a hermit crab with a shotgun shell!3. I\'d also like to know what beaches the crabs with shotgun shells are found on, as I would like to stay far away from those beaches. Stuart Anderson October 26, 2011 06:29 PM Instead of using this technology for the pet industry, scatter the printed shells in the areas that the wild crabs can use them. Then they won\'t have to resort to the shotgun shells or bottles.And, to alcalde, re. your point #3, the shotgun shells in question are the already spent ones that are empty. The crabs won\'t shoot at you ;-) Ed Reed October 26, 2011 08:03 PM I think some made in the shape of little Air Stream travel trailers would be a sell to the pet industry. Gregg Eshelman October 27, 2011 02:12 AM \"Sammy shuns shotguns shells in search of synthetic sea shell substitutes? seriously?\"I can\'t even say that once at normal speed, let alone say it fast five times. WIN!