The best way to store your Bitcoin seed phrase is a matter of some debate. It is generally not recommended to store it on any electronic device. Writing it on a scrap of paper is the standard method, but paper is easily lost, torn, or mistakenly discarded. It also doesn't hold up to the passage of time very well... It degrades; gets moldy; gets eaten by dust mites; etc. It's flammable. Ink can run on contact with water or other solvents, destroying what's printed on it. All in all, paper is not a great long-term information storage solution.
Print this sucker in ABS, and with proper storage, it should last for thousands of years. Or, if you're really paranoid, use it to make a cast metal coin that should last for millennia under almost any circumstances. I have a tutorial on how to do this!
Make Metal Parts with a 3D Printer (lost polymer casting tutorial)
Keep your seedcoin well hidden -- anyone with this seed phrase can gain access to your bitcoins! Because it's plastic, you could bury it in the ground, and it won't trigger metal detectors. This is a mixed blessing, since it will be harder for you to find it later also. So don't forget where you buried it!!
Have fun and stay secure! If you find this design useful, please feel free to send a donation to: 1EExevPZkgjoRFEbQzTFLpAoyDpwAdeQXw
Also, please send some love to JustinSDK, since this is just a tweak of his original Thing, and his design skills are really quite impressive!