Boot for barrel power connector (for example: https://www.amazon.com/gp/product/B01ER6QWAY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1). Print in TPU or other flexible filament to stretch around the end of the power plug.

FreeCAD file provided for tweaks.

Creality

Ender 3

No

No

Any

Any