terraPin OSKAR Tuxedo 6X9 Lochkamera

by schlem Jun 9, 2017
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Hi schlem,
I love your designs! Looking forward to printing and assembling the OSKAR Tuxedo in a few weeks.
I was wondering about assembly manuals. I haven't found any, besides the provided README and of course the photos. Is there any additional manual I am missing?

I am especially curious about the index window. You mention a 3D-printed window: Do you apply red transparent plastic sheet on top of the 3d printed window? Or do you print it with translucent red filament?


Hi nynyny

My aim is to design something so that assembly is obvious. I just haven't done it yet. :)
Seriously, this is good feedback. What would you want to see in a manual?

I wrote a VERY extensive manual for one of my earlier cameras, the P6*6, which covered assembly and usage. The usage part is still very pertinent to any of my pinhole cameras.

As regards the index window, I print it with a translucent red filament. It only takes a tiny bit. I print them dozens at a time so that I have a supply. Lacking a suitable filament, go to your local office supply store and find a red plastic see-through binder. I'd be surprised if it cost more than $2. Cheaper than a whole spool of filament for one tiny disk.

FWIW, documenting how to build my cameras weighs on me. I have three designs that I haven't posted yet, because I want to better document the builds. Thanks for the bump!

User's Guide for P6*6 Pinhole Camera
by schlem

Hey Todd,
Thank you for the quick response!

I have built a few pinhole cameras (35mm and 120mm) a few years back, before I had access to a 3D-printer, let alone great camera designs to print.

In the past I used thin transparent plastic sheets from an art supply store to use as index window.
However, the plastic of the binders you mentioned are probably a bit more robust. Also interesting to see that you actually print them yourself with red filament. That's pretty cool.

I'm looking through the doc for the P6*6 you linked. Thanks for that! I love the explosion view, which makes it great to grasp how everything fits together at first glance!

Since you asked, here is what I'd like to see in an optimal assembly document:

  • list of parts you need to have (either printed or screw/knobs/gears/...), in assembly order. with photo illustration.

  • list of tools you definetly. In need in order of importance. with photo illustration (one photo showing all tools with label for example, or each tool a separate photo)

  • seperate nice-to-have tool list. In order of importance (with reasons what is nice-to-have about them).

  • step by step instruction, what part to connect to which, with a single photo for each step like:

    1. Take part_xy.stl and connect it with the body, by sliding. (figure 1)
      Be careful, not to break XY, when applying pressure.
    2. Turn body around, locate hole for the something and screw part za.stl into that hole. (figure 2)
  • video, bird-view on the assembly table, with all parts visible and perhaps paper labeled for the video. Documenting the whole process, with time marks for each numbered step above.

  • perhaps also the additional info like explanation of the reciprocity failure and how to actually load and expose to light, and unload.

Of course that's just my dream idea of documentation and I understand this is a hobby project, I don't expect any such detailed instructions and I'll probably figure the steps out myself, I may even learn something in the process :P

In any case, when the time comes (~August '18) to actually printing and assembling this camera or a future model, I'll definitely document my process and share my experience putting it all together.

PS: I once built/designed a pinhole camera that used an Arduino + light sensor + servo motor for automatic exposure. The sensor+
arduinocontinuously measured the incoming light (outside) and adding it up, to automatically close the aperture (a little ad-hoc cardboard thingy) when the sensor measured enough light over a period of time. The camera design itself was not the best, but the auto-exposure worked really well in the end. It could react to sudden light changes, that could easily happen in longer exposure time. No more over or underexposed pinhole films!
If get some free time and motivation, I might revive this idea and try to integrate the sensor/motor into your camera design.


Just to be clear, a separate pinhole needs to be made/purchased for this, correct?

Awesome! Do you think you could provide files for laser-cutting the decorative cutouts? Either .svg or .ai (I could just cut them by hand I suppose, but I have access to a laser cutter).