Edit 2023-10-21: Q3 Lens Adapter Template V2
I noticed that the ridge by the nose is actually curved. That curve is now incorporated so the adapter sits flush.
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This fits into the Quest 3 lens well. Bring your own lens adapter or just glue a lens to the top of this.
Picture shows Quest 1 lenses.
I printed the Quest 3 adapter with a brim. Then, I superglued the Quest 1 frame onto the brim. Finally, I trimmed the excess brim off with a knife.
The author marked this model as their own original creation.