I had an old Celexon projector screen that had been stored in the garage for a long time. The plastic cover was damaged, so I finally decided to design a 3D-printed model part to repair the screen. I searched everywhere for similar parts, but unfortunately, Celexon doesn't sell replacement parts for their products, and I couldn't find any other 3D designs on the internet. My design had many flaws, but it was usable and able to get the job done.

Note: This screen is a spring-operated version, not an electric one.