I have qualified the design only in Hatchbox PLA+ in regards to the feel and fit of the parts. Other materials could require slight alteration of the part dimensions. I successfully printed them on both my Ender V3 K3 and Lotmaxx Shark machines, sliced in Prusa in both cases and always at 0.1mm resolution. Slicing in coarser resolution may give undesirable fit. A minium of fourteen pieces is required to complete a minimum size loop of 1.869 inch (47.4mm) ID I suggest you print in batches of four although bigger batches are certainly possible.
The author marked this model as their own original creation.