After much research, I have begun preparations to buy 3/4 hermit crabs. I have found that sourcing accessories and shells may be the most cumbersome aspect in terms of upfront purchases. It would make my life infinitely easier if I could just 3D print the shells and maybe a hut, but I did not want to try this before I was certain that PLA or ABS is non-toxic, and will not harm/irritate any potential crabs. PLA shells would be ideal, due to the reduced cost and slight environmental advantages, and the reduced fumes when printing.
Thanks

Apologies if there is already a post detailing this.