The question: can a 3D printed part function as a lens? Not a perfect optical instrument — but something that focuses or diffuses light usefully.

A Fresnel lens is the natural starting point. Instead of a thick curved lens, a Fresnel collapses the profile into a flat plate with concentric stepped rings — each ring approximating the angle of the equivalent curved surface. Much thinner, printable in flat layers.

Step 1 — Print and test

Two approaches to try:

FDM — clear PLA Printed on the Kobra X. Surface finish from FDM is rough at the layer scale — likely too much scatter for a clean focus, but worth seeing what you actually get.

Resin — clear resins Better surface resolution and the material can be optically transparent after curing and polishing. More promising. Several clear resins ordered for this:

• ABS-Like 2.0 Clear — structural, less brittle
• Standard Clear — higher detail
• High Clear / Transparent resin

See 3D Printing for the full resin inventory.

Not started. Print attempts and results to follow.