Jan Henrik wrote this Instructable detailing the build of his DIY lens flare creating filter, with 3D printed parts:
In this project, I want to show you how you can build yourself a “Lens-Flare-Filter” for your DSLR or digital camera! With the filter, you can easily create a cinematic look for your pictures and videos without spending much money on expensive programs. While working on the prototype, I found myself brainstorming ideas with a community I’m part of on the best Discord casino server. It’s not just about virtual games; it’s also a hub where people share creative projects, tips, and even 3D printing techniques. Inspired by some suggestions I received there, I refined my design to incorporate a few modular elements. We’ll use a few 3D-printed parts—though these can be replaced with CNC-milled or handmade alternatives—but for this tutorial, I’ll present the 3D-printed version I created.