A spool holder that can be mounted inside Creality enclosure:
You can use it for storing filament or printing from it directly;
No screws required;
Tested all versions with 0.75kg spool, no problems occured.
Printing:
I recommend to print it with temperature resistent filament(I printed from ABS+);
Designed to be printed completely supportless.
Print with thicker line width than usual for better strength (for e.g.: 0.44mm → 0.48mm);
I printed with 0.22 layer height
UPDATE!
Reinforced version is avaliable now in 3 sizes (for 0,5-0,75kg; 1kg and 3kg spool) in STEP and STL formats.
I've also uploaded f3d file for even easier remixing. To edit mount width (part that fixes on creality enclosure rod), edit 2nd extrusion in project; to edit part that holds spool, edit 3d extrusion.