Filament Guide for PVC Pipe

This is meant to fit on the end of a 3/4" (inner diameter) piece of PVC pipe, to fit in better with your existing PVC pipe filament/spool setup:

https://www.thingiverse.com/thing:1980779
https://www.instructables.com/2-Minute-PVC-Filament-Holder/
https://www.thingiverse.com/thing:139907

I had pretty good luck without using supports for the inner overhang, but even if it droops a little bit, it's not going to affect the fitting as it turned out to be fairly tight.