PTFE Cap for Side Spool Holder

A simple threaded cap to fit onto the PTFE holder on Mdesign's excellent Side spool holder for P1S, X1C (https://makerworld.com/en/models/236809). Among the comments for the spool holder, the user @limbo mentioned that he'd designed a simple cap to protect the PTFE holder.

I decided to make my own design, with a knurled knob and a threaded spigot. I used a Bambu P1s with Bambu PLA and 0.20 mm layer height for the print in the picture, 15% gyroid fill, and no special settings.