Slide holder for galaxy projector pictured such as this one https://www.amazon.com/Projector-Planetarium-Bedroom-Ceiling-Birthday/dp/B0BVMGG5KR or many others that look like it on Amazon. Fusion360 file included in case you need to tweak it.
Printed in white PETG on Prusa Mini with 4 perimeters for strength.
The author marked this model as their own original creation.