This is a remix of CometCoffin's Metapen Clip. It serves the same purpose, however I made it a bit thicker for my own comfort.

Printed at 106% size for a snug fit on a K1SE using Orca Slicer. Don't know why Creality Slicer does not like the shape of the USB-C adapter and does not print the whole circumference. The Metapen I'm using is for the iPad, although it should work for any device with a USB-C interface.