I was too lazy to design my own cat ears so i downloaded the original model and since i hated the idea of glueing them to my earphones i made them easily attachable using a rubber band.Of course the crappy rubber bands shown above are just for better visibility of the attachment mechanism.I would highly recommend using something more simmilar to the last picture.

Just wrap one side of the rubber band around the ear and hook the other side on the pin on the rear (viz. photos).

I would also recommend scaling the model in your slicer to fit your headphones better.Ideally so that the height of the ear in the printing orientation (viz. slicer pic.) is equal to the width of your earphones headband.

Should hold well on most headphones but the curve might not fit exactly.

Hope you enjoy !