This Bitcoin is different. Address and Key created offline. "See youtube video on how to, creating "Cold Wallets". You can put money in many times, but remove all at once. This coin would have the key embedded into the center during printing.
My Idea of this was for those people who feel they need a physical form of currency. If you do it right you can scan the printed QR code and check the balance on your phone. When your ready to spend you break the coin open get the key out and scan that QR code; to SWEEP the entire amount into a hot wallet.

Steps;

1. Create a paper wallet offline
2. screen cap the BitCoin QR address (do Not Screen Cap The Key QR)
3. Print out Paper Wallet. x2,one for back up
4. clear out any evidence of Key address from computer. Go back on line.
5. Use tinker cad to place a 3d image of your Address QR (NOT KEY QR) on the blank side of the coin.
   -.1mm thick
   -11.9mm in elevation
   Does take some trial and error for this (it's a practice makes perfect type of thing)
6. I sliced at .1mm. QR might show up better at .06mm. More detail better the QR can be read from a camera.
7. At roughly 66% during slice Pause or if your quick, slip in the cut out piece of the KEY QR code from the paper wallet and put it in.
8. At roughly 86% change the filament color to black (this is for the Address's QR code)

Also Try CryptoTab for Chrome Web: https://getcryptotab.com/1644085

Currently the best way I found to passively to get free Bitcoin. This is a fun hobby.

Please tip Bitcoin, i'm just having fun with cryptocurrency .
Bitcoin Address: 15FRKT8RSZ5tJyt3DphS8keV9AdfVtNqoz
Litecoin Address: LVgZbufrNzzLocrQvHsv8q7ejE8gPFZwmv

MonoPrice

No

Yes

.1mm Possibly better at .06mm

10%

Supports (ONLY ON BED). If you put supports on everywhere you won't get the void you need in the center.