A few years ago, I built a movie projector out of LEGO. I posted pictures of it in Wikipedia.

In the notes that explain these images, I explain that the width of the film is 31.4 mm.

Is it the right width, taking into account the play necessary for the operation of the mechanism?

  • Hi Bernard and welcome to Bricks.SE! This is a site focused on questions and answers about LEGO and other building bricks, but your question seems to be about the dimensions of a film strip, without any relevant connections to the LEGO system. Therefore I propose that your question be migrated to either Photography.SE or to Engineering.SE, where the community is better geared to answer this.
    – zovits
    Commented May 7, 2021 at 8:56
  • Hello zovits! The width of the film is conditioned by the thickness of four LEGO elements. This is why I am inquiring about the exact thickness of these elements ... It's a bit the same thing when you build steam machines out of LEGO: you use the round brick as a piston and you slide it into a syringe body ... Regards, ~ Bernard Commented May 7, 2021 at 9:52
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    So if I understand correctly, you already know that the film strip is 31.4 mm wide, and that it is the same as four LEGO elements. What is the unknown variable? The exact dimensions of LEGO bricks? If so, here is an answer detailing just that. The last sentence about the steam machine and the syringe body is a bit confusing, I can't see how it is the same thing as advancing a film strip.
    – zovits
    Commented May 7, 2021 at 14:23
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    For other contributors: To see how the 4 elements width is to be understood in the context of this question, see the (mostly) LEGO model mentioned in the question here, found by following the links in the author's Wikipedia profile.
    – zovits
    Commented May 7, 2021 at 14:30
  • 2
    Perhaps rewording your question entirely could change community's view. Something along the line of "I have a space of 4 studs. What is the maximum width of a film I can put into this gap?" would work. Adding pictures and explaining your issue in more details also helps to provide a clear answer/advise.
    – Alex
    Commented May 8, 2021 at 17:27


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