Filter holder for the Seestar S50

Filter holder for the Seestar S50. For 2" filters with M48 threads; includes optional protection against dew or stray side light.

It attaches to the S50 / S50 Pro using a flexible TPU ring that snaps into place. The assembly consists of three parts, designed so that the flexible ring is sandwiched between two rigid pieces (matte PETG) and cannot come loose. Bonding PETG and TPU with adhesive is always difficult.

I used Filamentum Flexfill 98A and Prusament PETG Matte Black.

The part Anell_roscat_M48_S50 is printed with a layer height of 0.1 mm. However, it can be printed with a layer height of 0.15 mm, or even 0.2 mm, with acceptable results. The remaining parts can be printed at 0.2 mm.

The threads have a small groove that serves to hide the seam and ensure that it remains without defects. It is convenient to use it if you make your own laminate.

Among the files, you will find the STP file for the flexible part, in case anyone needs to make adjustments to the piece based on the material used.

Assembly

1- Fit the TPU ring (Acoblament_elastic_S50) over the smooth ring (Anell_tancament), taking advantage of its flexibility.

2 – Glue the two parts to the threaded ring (Anell_roscat_M48_S50). You can use cyanoacrylate or epoxy. Remember to clean the parts thoroughly and use sandpaper (120–180) to scuff the surfaces.

Optionally, I have added a protection against dew that can be quickly attached to the filter holder with a quarter-turn.

This material is used by the AstroMontseny team. Join us on Instagram: https://www.instagram.com/astro_montseny/

I hope these pieces are useful to you and that you have good night skies!!!!