That black plastic object is just going to absorb infrared light and look invisible.
You’ll have to paint it or use a subliment on it
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Mix baby powder in IPA and spray it onto the model, Once dried it will scan. After you just brush if off
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For those living in the northwest 
IPA is NOT Indian Pale ale
It is Isopropyl Alcohol (IPA).
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Exact. Do not waste IPA the beverage on this trick
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Good tip, now I need a proper air brush pistol (had an old one, that performed poorly). I needed a proper one anyway, for painting fdm printed objects.
I used a spray bottle from the hardware store. Had on lying around and the nozzle was too small and got clogged