<p>Are there SLA printable resins that can be printed with optical clarity and whose index of refraction make them potentially useful for optical applications? I would assume the surface may need polishing, and that's okay - I'm just asking whether the materials and process are otherwise suitable.</p>

[{'answer_id': 19437, 'author': 'Aaargh Zombies', 'author_id': 29097, 'author_profile': 'https://3dprinting.stackexchange.com/users/29097', 'pm_score': 1, 'selected': False, 'text': '<p>No, at least not at a consumer level. The layering created by the printing process would create imperfections, and clear resin frequently yellows if not cured properly and then protected form strong UV light. Resins that do not yellow tend to have a blue cast to them.</p>\n<p>You would be better off using a commercial grade casting resin and a pressure chamber to remove bubbles. Even then it would be inferior to silicates for even basic lenses.</p>\n'}, {'answer_id': 19446, 'author': 'Trish', 'author_id': 8884, 'author_profile': 'https://3dprinting.stackexchange.com/users/8884', 'pm_score': 0, 'selected': False, 'text': "<h1>Clear Resin isn't clear everywhere</h1>\n<p>Any light-curing resin has a specific bandwidth to which it is totally opaque just to be able to cure. This is typically a blue color, but at this and adjacent wavelength, the lens will not allow light to pass through it, no matter if you can manage to get imperfections down.</p>\n<h1>Resins change color</h1>\n<p>Then there is the problem of resins changing coloration. Most cast resins become yellow, and some go blue, but in either case, they do absorb some spectrum to appear as this color.</p>\n"}]
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