One 35

is the new 3D printed camera from Clint O’Connor that uses 35mm film. Printed in one solid monolithic block, the One 35 is a complete one-shot camera for 35mm film. Add a pinhole and you’re good to shoot.

Simplicity, Printed

Designed to be quick and easy to print and load, the One 35 opens a world of creativity. Leaving off the shutter not only makes the camera simpler, but expands the possibilities of sequential or simultaneous exposure. Think of new applications where you can use such a small camera or multiple cameras. For instance, past imaginative examples include:

The very low cost of these cameras also make them perfect educational tools for teaching basic pinhole photography.

Open Source

Best of all, the One 35 is open source under the CC by SA 4.0 license! In short, it’s free to make, even commercially, as long as you attribute my work and share any changes. Click on the CC by SA logo to understand the license terms.

(scroll down for support information)


What can you do with a loaded bag of these cameras?

One 35

If you have access to a 3D printer, you can make your own cameras!

Step 1: download the files
Step 2: print yourself or use 3D Hubs

  • 3D printed – one piece body

  • 35mm format film, 1 exposure
  • Image size – 24 x 35mm 
  • Field of view – 114 degrees
  • Focal length – 14mm
  • Pinhole diameter – 0.15mm – 0.20mm
  • f/Stop – 93
  • Size – 40mm x 40mm x 20mm (WxHxD)
  • Easily printable even on smaller 150×150 mm bed 3D Printers
  • Print in PLA or PETG (ABS not yet tested)
  • Requires only a 0.15mm pinhole in 19-20mm disc (try eBay or make your own) to complete
  • Optional – Buna 018 o-ring (pinhole retainer), or use rubber cement (removable)

  • FREE







Loading this camera could not be easier. The film passes completely through the One 35, making it simple to load all your cameras in one pass. Following loading, you can cut the film flush to the camera bodies for single exposures. Alternatively, you can leave them in a string for sequential or simultaneous exposure. A changing bag works well if you do not have the convenience of a darkroom at hand.

Exposing the film requires a “shutter” of some sort. Use black tape across the front, pulled off and replaced. Alternatively, a cover over multiple cameras, or a sequential sliding/rotating shutter enable more complex configurations. Your creativity and imagination come into play here. The One 35 provides the canvas on which your vision is painted.

Film & Processing


The One 35 uses standard 35mm film in 24 or 36 exposure rolls or bulk 35mm film. Bulk film makes sense if you will be shooting a lot of film or loading long strips of cameras. You’ll need a changing bag to load and unload the cameras.


Processing is likely to be a home lab affair. Because of automated 35mm equipment, most processing labs will probably not accept cut film. That means you’ll need to develop your own. It’s not hard, and it’s quite fun to see your own images appearing. You’ll need a developing tank and chemicals, but which depends on how you use the cameras.

Strips of film – best in a 35mm plastic reel and developing tank, like Paterson or Arista. Wire reels are not recommended because the 35mm film gets kinked and does not load well.

Bits of film – best in a stainless steel 120 tank. You can print your own rack (photo below) to hold the bits of film for processing. This rack is notched alternately left and right to help you guide the film bits into the correct slots by feel in darkness. This rack may fit in a plastic developing tank but I have not tried it yet.


Film can be developed in a number of different chemicals but the process is the same. Develop the film and then fix it to make it permanent. You can even do this in one step with a monobath developer, or use coffee as a developer (google caffenol).

Recommended Equipment

  • Developing tank (as mentioned avove)
  • Developer
  • Stop bath (optional)
  • Fixer
  • 3D printed developing rack
  • Changing bag (medium or large)


  • Proofs #1-#4 (private)
  • II A1

Exposure Table

Recommended Apps

  • Android
  • Please suggest what works best for Android (email at bottom of page)
  • IOS (I use both of these when I don’t have my tables with me)
  • Make

    The One 35 is 40mm x 40mm x 20mm and takes less than an hour to print. As a result of the low cost, you can buy or print many of these cameras. Load them all, take them out of the changing bag as needed and return them after exposure. At the end of the day, develop your bag of cameras. Print the developing rack as well to hold the strips of film for processing.

    The very low cost of these cameras also make them perfect educational tools for teaching basic pinhole photography.

    Tip: Run stringing tests beforehand to calibrate your printer and plastic for zero stringing. Any internal strings will affect your images and are nearly impossible to fully remove after printing.

    Support Posts