These are 2 different fictional articulated trilobite models. They are variations on my original trilobite bug thing with a bit more detail.
They print well in a resin printer but do not scale them down less than 40% and wash the uncured resin out of the joints thoroughly before doing the final post-print curing.
They articulate very well.
Check out my YouTube Channel ( Jimson's Stuff) where I make all sorts of things and also review tech including 3D printers.
https://www.youtube.com/channel/UC6h82LH3PtdiSHaj_7f09Fg
The author remixed this model.