Hi, used these two great models, one from Fred Boisselier, https://www.printables.com/model/540699-creality-k1-max-side-load-spool-holder and the other from Hugo Groeneveld, https://www.thingiverse.com/thing:3020026 to create an excellent side mounted spool holder with bearings for the K1 Max.

This model replaces the one center back screw with (M312) and the bottom right fan screw with (M314) for mounting.

You will also need 2 x 608 type bearings.

Updated: Added model with K1 Max logo.

Updated: Added model with filament tube guide with thanks to ThomaS, https://www.printables.com/model/552999-creality-k1-max-side-mounted-spool-holder-with-pft great help.

Updated: Added model that only requires the original spool holder as requested by many.

Updated: Added model with built in spool and ptfe holder, doesn't roll as freely keeping the filament tighter preventing tangles. Hole is 4mm for ptfe tube, if you would like a fitting instead, you can drill it out and tap as required.