Filmstrip Projector | Slide Projector | Film Slide Projector

Updates

2025-8-1
 

Added Canon FL mount lens adapter module

2025-3-21

Added Olympus OM mount lens adapter module, image quality further improved, see print profile for new module

2025-3-14 

Fixed the problem of insufficient heat dissipation for old LED beads: Replaced the old adhesive fixing method with thermal paste + nylon screw fixing method (adhesive has insufficient heat dissipation and risks melting LED solder joints), greatly improving heat dissipation efficiency (Accessory pack updated)
1. This method requires two M3 * 6mm nylon screws to avoid potential short-circuit issues with metal screws
2. A tapping tool is required to tap M3 threads onto the original heatsink

3. The model shown in the figure is used for drilling positioning, a drill bit of about 2.7mm is recommended

4. After updating the thermal silicone, thermal imaging tests showed good heat dissipation performance:
 

10 minutes, 30 minutes, 60 minutes, left side shows LED bead surface temperature, right side shows heatsink temperature

Projector surface temperature after 1 hour

I sampled the temperature multiple times using a thermal imaging camera after 10 minutes, 30 minutes, and 60 minutes of projector operation, as shown in the images: To further confirm measurement deviation, I touched the heatsink after 60 minutes of operation The result was that it could be continuously touched, felt hot, but could be touched without letting go

Design Background

In recent years, film culture has experienced a resurgence, evident from the rising prices of film rolls and the increasing appearance of film positives on social media Projecting a tiny negative, magnified hundreds or thousands of times, onto a wall is inherently a romantic endeavor Additionally, with recent improvements in inkjet printer resolution, photos printed on film paper have become increasingly clear Thus, I decided to validate my idea
 

Approach

1. I want this slide to be clear enough, not just any convex lens for imaging without regard for image quality; it is not a child's toy
2. I want it to be easy to assemble, without custom parts, and readily available on shopping websites
3. I want it to have sufficient brightness to support projecting an 80-inch screen
4. I want to be able to change the projection distance by replacing different convex lenses to suit various projection spaces
5. Ideally, it should be powered by common Type-C, running with a high-power phone charger or high-power power bank
    

Design Highlights

1. By using a double-layered achromatic lens, chromatic aberration is minimized as much as possible while ensuring cost-effectiveness, and actual tests show good clarity even at the edges of the image

   

    

2. High-power LEDs are used as the light source, and naturally, to meet heat dissipation requirements, a heatsink and fan have been added The resulting additional fan noise is, fortunately, within an acceptable range

   

    

3. Thanks to the Type-C protocol, 12V voltage can be easily obtained from a high-power power bank

   

    

4. Modular design reduces printing difficulty, allowing for future upgrades by replacing specific modules, such as changing lenses, using higher-power LED beads, or projecting larger negative sizes

   

    

5. Currently, the projector slide tray size is 50mm x 50mm, so commercially available 135 film holders are perfectly supported I used an inkjet printer to create "negatives" measuring 44mm * 32mm, and the effect is decent

   

    

6. This design currently includes an Arca-Swiss standard quick release built into the body, compatible with common tripod heads The 3D Printed Tripod is shown in the image

    

    

Effect Showcase

Note: The negatives in the following images were printed using an inkjet printer In theory, using slide film would yield better results, but since this project is just starting, I do not have any slide film on hand, apologies
The Mac Book Pro M1 (13-inch) below the projection serves as a reference for the image, with a projected screen size of approximately 1.7m * 1.3m

Assembly Video

Accessory Pack

Main Lens: Diameter 31
Fresnel: Focal length 25mm Diameter 60

LED: 12v 5050

Heatsink: 35mm * 35mm
Fan: 4010 12v
Screws: M3*10 Quantity: 8
Type-C decoy: No name or model
Switch: 1208YD

Wires

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Update: Several friends asked about purchasing the accessory pack I tried to create a Taobao link and put the address in the comments section

Update: If you only want to buy individual accessories, you can search for them yourself based on the accessory information in the details and purchase them one by one (I do not want to advertise for any merchants, so I will not provide links, I hope you understand) Also, if you are only buying a single accessory, I do not recommend buying from the Taobao link I provided, as there is no price advantage and it will not save you time, and it creates a lot of extra work for us, which goes against our original intention Please understand Taobao is not a place for technical communication, if you have any questions, please private message me here, thank you
 

The free download of this model is for personal use only You may not sell these printed parts or digital models