Sangheili Arum Puzzle (Toy from the Halo Series)

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Note: This is still a work in progress, I have since printed three layers and feel confident in the thickness and tolerance to post all the files. Let me know if you have any issues. Introducing my version of the Arum from the Halo books: "Glasslands", "The Thursday War" and "Mortal Dictata" all by Karen Traviss. This is not an official interpretation, but what I imagine when I picture an Arum based on the book's description and the Halo Wikipedia entry. So what is an Arum? An Arum is essentially a Sangheili (Elite) version of a Rubik's cube, a puzzle with a lot of complexity yet simultaneously very simple. An Arum consists of a series of concentric spheres with a jewel or stone at its center. The way to solve this puzzle is by aligning a hole in each spherical layer until you reach the center and pop the stone or jewel out. The idea is to teach discipline and patience to young Sangheili warriors. An Arum shares many features with a real-world item called a "Chinese Sphere Puzzle," which consists of concentric spheres carved from a single piece of Ivory or Jade. However, the intent of the real-world equivalent is to be ornate and very fragile. My take on the Arum features a single hole per layer, unlike other versions and the Chinese puzzle, which have multiple holes. It is roughly the size of a soccer ball, with layers 1.5mm thick, a tolerance of 1mm, and a hole diameter of 75mm. I currently have twenty layers of spheres on file, so print as few or as many as you like. Here's how it works: There is a file for half a sphere with a 75mm hole in the center and a second half-sphere with no hole. This setup eliminates the need for support if you can print at an angle above seventy degrees on that half. Each of the two halves shares the same layer number, so you print one with a hole, one without, glue them together, and move to the next larger layer. You can also print two halves without holes and drill your own hole if you prefer a different size. Alternatively, I made spheres with two holes by printing the file with the hole twice because I was experiencing issues with support remnants interfering with the next layer. Also, don't be afraid to simply print the no-hole models and drill your own holes to the desired size. With good layer adhesion, drilling is possible, just take it slow.