Summary

Holiday/Christmas themed DIY light show projector. Not sure if there is a better name for this, but you can project any image that can be printed as holes on the slide.

The way it works is you stick all the pieces together with one of the design slides sandwiched between the projector body and the mirror housing, and then the flashlight shines through the mirrors, through the slide, through the two lenses in the projector body, and the image is projected onto the wall. More distance to the wall = larger and clearer image.

I created 3 slides which you can swap out - the Merry Christmas design, the Happy Holidays design, and Santa's Sleigh - santas sleigh is the worst result print-wise, so you may just want to skip that one. The other two turned out fine with only small details lost.

Feel free to remix this/make your own custom slides using the ones I have uploaded as examples, here are the dimensions for the slides:
Slide size: 80x80mm
Design area: 47.5x47.5mm (centered)
Slide thickness: 3mm

Projector Body is 80x80x173.5mm
Length of assembled projector is ~165mm
Height of assembled projector is ~128mm

This project requires a few non-3D printed parts, including:

~$10-20-A bright flashlight with a tight beam (I used an LED one which is no longer for sale)

$24.99-Slide Viewer (for the lenses - I had one already which was the inspiration for this project) - example - https://www.amazon.com/MAFUEAY-Negative-Lighted-Illuminated-Magnification/dp/B0C13N2PS1/ref=sr_1_9?keywords=35mm+Slide+and+Film+Viewer&sr=8-9

$3.99-Square folding 1x/2x compact mirror - https://www.amazon.com/dp/B0BC25YPR9?psc=1&ref=ppx_yo2ov_dt_b_product_details

All parts were printed in PLA, and no supports are needed for any of the parts. Your printer needs to be relatively dialed in to get the image slides precisely right, there are a lot of fine details, but mine isn't perfect, and I think the somewhat ragged look is a cool effect anyways...

This is all custom designed, it was a gift for a friend but I think it turned out pretty cool after several revisions, and I figured others might be able to take this idea further, create more slides, etc. - Colored light filters? A slide module which holds actual slides and lets this project color images onto the wall?

You can also just attach the flashlight or light source directly to the projector body if you don't want to deal with mirrors, it will make the projector considerably longer, I added the mirrors to be able to mount the flashlight on top to position it on top of a narrow bookshelf, but they are not needed if length isn't a concern..

Print Settings

Printer Brand:

ELEGOO

                                            Printer:                      
ELEGOO NEPTUNE 3

Rafts:

                                            Supports:                      
No

Resolution:

0.2

                                            Infill:                      
20% (100% for Projector body)

Filament:

Elegoo PLA

                White                    
                        Notes:                     Elegoo Neptune 4

0.4mm nozzle

Post-Printing

Assembly

            Remove lens assembly from slide viewer.

Separate smaller lens + pyramid shaped shroud from larger lensSnap the design slide onto the projector body.Place larger lens with the more concave side facing TOWARDS the design slide, and secure it in place with the Lens Holder pieceSecure the shroud + small lens in the other end of the projector body, with the large side of the shroud facing outwards (use tape/glue if yours doesn't have the same shape as mine)Snap the mirror assembly onto the holes on the design slideRemove the 2x magnification mirror from the compact and slide it into the bottom slot on the mirror assembly. You're left with the 1x mirror in the folding compact and the other side is just an empty frame - fold that back up so that you can still see the 1x mirror, and slide that into the top slot on the mirror assembly, taking care to align the 2 mirrors in the vertical direction so the light bounces properly.Snap the flashlight mounts onto the top of the projector body (or just use tape/glue if your flashlight doesn't fit) so that the flashlight beam is parallel to the projector body and shines directly into the center of the top mirror.Position the stands on the bottom of the projector body to give your projector the correct angle. Best to place this somewhere up high or pointing up at the ceiling as it can be quite bright if you walk directly in front of it.