Amazing model that is print in place and that can be opened and closed by twisting the outer shell.
Scaling is not advised, as the clearances and the functionality of the mechanism get compromised.
print with 0.2 mm layer height. Do not scale, because the lid won't stay closed if you upscale, and won't open if you downscale. After printing, just cut out the connecting tabs at the bottom.
The author hasn't provided the model origin yet.