Variable ND Sunglasses

Objective: Use variable ND lenses to make sunglasses that adjust the amount of light passing through. Problem: Other products that do this don't synchronize the angle the lenses twist at — turn one and the other lags. Solution: A timing belt running along the perimeter of both lenses, ensuring they rotate at exactly the same rate no matter which side you twist. Built as a small project to wear at the Open Sauce convention. The frame uses PETG as a removable support material with PLA as the main body, which gave very clean surface tolerances on the small features. Plates fasten to the main frame with small glasses screws that thread directly into the printed parts. The aesthetic borrows from steampunk and ship port windows — the fasteners aren't hidden, they're intentional features.