isnt it just the eyeglasses with your prescription lenses? You pop the lenses out and put them in the frame you 3d printed? Im guessing.
It's very important if you buy spectacles just so you can remove the lenses that you mark the lenses so you can tell which way is up. Modern lenses have an orientation (this is especially important if you have astigmatism). If you remove the lenses from the specs and put them in the VR lens holder at the wrong orientation then you will get blurry vision.