I think we have found the solution to our tone ring assembly problem!  Snap fit connections were good for single use.  Screws on the other hand are great for reuse but hard to use with plastic parts. Enter heat-set threaded inserts!  Thanks Jeremy Wright for pointing this out to us!

Never again let the broken threads of your 3D printed parts ruin your day. Use heat-set threaded inserts when fastening parts together.

Source: Fasteners for 3D Printing – Using Heat-Set Threaded Inserts | MatterHackers