Custom 3D-Printed Filter Case for Analog Sky Heart Binoculars

On October 7, 2025, the 3D-printed parts for my latest astronomy accessory project finally arrived—and I couldn’t wait to put them together! This project was all about creating a practical and elegant filter case for my Analog Sky Magic binoculars.

Why a Custom Filter Case?

Analog Sky filters are incredibly easy to use. They simply slide under the eyepieces and stay in place thanks to a clever magnetic design. However, storing and organizing multiple filters can be a challenge, especially if you want quick access during a stargazing session. That’s where this custom case comes in.

Design Features

• Magnetic Filter Holder: Just like the filters themselves, the holder uses magnets for secure stacking and easy handling.
• Expandable Layers: The design allows for modular stacking. You can start with one layer for a single set of filters and add extra layers as needed. I opted for three layers, giving me space for three complete filter sets.
• Compact and Sturdy: The case is 3D-printed in black filament, giving it a sleek look and solid feel. It fits perfectly in my observing box without taking up too much space.

Assembly and First Impressions

Putting the case together was straightforward. The magnetic alignment works beautifully, and the filters slide in and out effortlessly. The layered design makes it easy to keep everything organized—no more fumbling in the dark for the right filter!

Final Thoughts

This custom filter case has made my observing sessions much more efficient. It’s a small upgrade that adds a big dose of convenience. If you’re using Analog Sky filters and want a neat storage solution, a modular 3D-printed case is definitely worth considering.