# Fuse+1 Optical Cassette **URL:** https://forum.formlabs.com/t/fuse-1-optical-cassette/46723 **Category:** Fuse 1/1+ **Created:** [August 10, 2026, 1:48pm UTC](https://forum.formlabs.com/t/fuse-1-optical-cassette/46723 "2026-08-10T13:48:21Z") **Posts on this page:** 1 **Showing post:** 3
### Author: ![Nihal\_Drotsa](https://avatars.discourse-cdn.com/v4/letter/n/dbc845/32.png) [@Nihal\_Drotsa](https://forum.formlabs.com/u/Nihal_Drotsa) #### Post date: [August 10, 2026, 7:27pm UTC](https://forum.formlabs.com/t/fuse-1-optical-cassette/46723/3 "2026-08-10T19:27:04Z")
Hello, I am not a Fuse 1+ owner but I came across a similar looking pattern in an older post . It may be conjecture but I think it is worth looking it into - > [@Maintenance advice](https://forum.formlabs.com/t/maintenance-advice/46626/3): > > We have a Fujifilm X1 camera whose lens developed similar patterns. When we took it to a service centre, we were told that it was fungal growth, so I am making an educated guess that this could be the same issue. High humidity creates an ideal environment for fungus to grow. It happens quite often in camera equipment, although it is usually more visible on a lens. The image below shows fungal growth on a camera lens, and the pattern looks similar. The marks on the metal frames in y… --- _[View the full topic](https://forum.formlabs.com/t/fuse-1-optical-cassette/46723)._