A nut useful to the folks whose Creality CR-10 was shipped with one nut on the spool holder missing. Replace one of the hex nuts with two of these and your spool holder becomes as sturdy as it should be (alternatively you can just print one and mount it as illustrated in the first picture).
I used 0.15 mm layer height and 1.2 shell and bottom/top thickness.
NOTE: If the current scaling of the model is too tight (or too loose), try bumping up X- and Y-scaling (or the other way around) :)
Please don't hesitate to tell me if it doesn't work because I'm also new to this so mistakes can happen ;)
100% (doesn't really matter)