Here is my lens cover for the Valve Index VR headset. I've been selling them on Etsy for quite a while, but it's time to give this one away for free. If you still want to buy one, the Etsy link is https://baptiewright3d.etsy.com/listing/794681780/new-valve-index-full-lens-coverprotector

PLA is fine for this, use adaptive layer height for smoother edges but give them a quick hit with sandpaper before use to make sure there are no sharp edges near your lenses.