This dust cover fits an European NES controller, but due to possible slight changes between the versions you might need to tweak the fusion360 file to your needs.
It should be a snug fit, if not you can tweak the plug wall size to adjust the model to your printer's capabilities as well.
Please note that if you look for the complementary female plug you can check out the base model.
The author remixed this model.
Tweaked the fusion file to make a dust cover for the complementary male end of the controller.