I’m building this at the moment. Could work for your needs. All in it was $130 for parts.
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the scanners for small stuff don’t do big stuff, and scanner for big stuff don’t pick up details under a certain size …
This guy explain the details pretty well:
(his casting videos are pretty good too 
)
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My weekend project:
Since I use my Mac Studio with a Keychron keyboard, I am out of luck when it comes to having Touch ID. (Hopefully someday we will have a PIV applet for the Apex and I can just use my implant instead) Touch ID is only available on Apple’s Magic keyboards and Apple doesn’t make standalone sensors. One option some people use is to buy a Magic Keyboard and tape it under their desk so they can reach under and scan their fingerprint. I didn’t want to do that. A couple years ago, I saw a project by SnazzyLabs where you can take the sensor out of the keyboard and put it in a 3D printed case. But at the time I didn’t want to spend $130 just to rip apart a keyboard a possibly break it.
However, I also use a Magic Trackpad and the other day I saw a 3D Model for a base that also has room for a touch ID sensor! So I bought a refurbished Magic Keyboard from Amazon for $70 and very carefully ripped it apart and harvested it’s organs. Now I have a beautiful Trackpad base with built-in Touch ID!
Side note: Anyone wanna buy a “brand new” never been typed on Magic Keyboard? I’ll make you a good deal. 
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