NOT my scan, I have cleaned up the scan to be suitable for printing. Released by PRI under Public Domain. Please PLEASE donate to the digital atlas of ancient life or PRI if you have the chance or opportunity. Like all their stuff, give them a lollypop, call them cute, ask them out to dinner, whatever you can do, do it.

Original model can be found below
https://sketchfab.com/3d-models/trilobite-e-crassituberculata-pri-49388-da7c87704c294d69b857c6e54530bfe0