Flexible Filament Sample Spool Adapter remix

I needed a way to balance the flexible filament sample spools on my hanging spool holder rod. I found arcmatt's design, but in my case the bearings are on the ends of my spool rod, so didn't need them in the adapter pieces. I also needed a way to lock the two ends together inside the spool. So I modified the design to include threads to screw the two pieces together, and increased the center hole diameter to allow a bearing to pass through.

Parts can be printed without support or brim needed.