Based on Fred Boisselier design: https://www.printables.com/model/540699-creality-k1-max-side-load-spool-holder

I added bigger and deeper screw holes and a mount for PTFE. You'll need one M3 0.5 x 12 and one M3 0.5 x 16 screw. Plus a longer section of PTFE for my design. More detail in this video: https://youtu.be/BQM7xBcZh00