This model is designed to be two calibration cubes that thread together. The calibration cube has become an icon in the 3d printing community and this gives them an additional purpose as a fidget toy.
This model has very loose tolerances that allow the threads to move very easily. This should be easily printable on the vast majority of printers.
I printed it in Creality Hyper PLA on the K1 and it turned out great, It moves very smoothly.
If you are looking for a thread test, here is a link:
https://www.printables.com/model/958100-thread-test-003mm-02in-chamfer
The author marked this model as their own original creation.