This is a Remix of the knob COVER for the X / Y axis belt tensioner on your Ender 3v2 and others using the same OEM blue knob.
You can find my other matching knobs here:
I have found some newer Ender 3/3v2 printers have slightly larger knobs (blue knobs). Scaling your print to 101.5 - 102% should help fit these models.
The author marked this model as their own original creation. Imported from Thingiverse.