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My Elmo 16mm rewinder adapter for super 8mm reels

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  • My Elmo 16mm rewinder adapter for super 8mm reels

    I’ve always wanted a 3D printer, but could never justify a real need, until I decided to make rewind adapters for my Elmo 16mm rewinders - these rewinders are in excellent condition and a pity I was not able to dual purpose them.

    After looking around a bit I purchased a Creality Ender 6 3D printer which can print objects of 250mm wide x 250mm deep x 400mm high and can print 150mm per second - that is quite fast for an amateur 3D printer, although in reality it seems that one typically prints a bit slower than that. The adapter below takes about 27mins to print for example.

    The next task was to find a 3D modelling or CAD program and an electronic calliper. I initially settled on OpenSCAD which is open source and free and more geared to programmers as you type out your model using geometric commands like translate, cylinder, cube, etc and it takes a bit to get it right, but it does render your model so you can see what it looks like as you proceed.

    Then you need a slicer programme to convert the *.sft file from the 3D modelling programme into a *.gcode file that is understood by the printer, but there I used the one that came with the printer. I have an old cheap electronic calliper that barely works, so will upgrade that in due course.

    It took me about 4 attempts to get the sizes just right, but it works very well.

    The printing filament is PLA+ which results in an adaptor that seems very strong and should last for a long time.

    it is early days and I have a lot to learn, but it is very satisfying so see a 3D object being made from nothing. Next on my list is a scope bracket.

    Some pictures:

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  • #2
    Some pics of the actual printing...
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    the printer int the process of being assembled:
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    An earlier version of the 3D model rendered in OpenSCAD:

    Click image for larger version

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    Comment


    • #3
      An excellent project, however, it would not fit on my British 16mm rewinder. This was made by the famous Robert Rigby Ltd with their trade name of Premier. They made mainly for 35mm but did include some 16mm items such as rewinders and cement splicers.

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      • #4
        I know there are a few online places that sell these adapters, but none of those seem to imply that the would have fitted 100% on my Elmo rewinders, hence my DIY project came about.

        I don’t know the Premier rewinders, but arguably one should be able to make these for any rewinder, provided that you can measure them accurately and ideally use trial and error as I did.

        One thing that still slightly baffles me is that I had to add an extra 10% to the size of the square and round holes, despite measuring those directly off of a 16mm reel, which should already include some play to allow fitting over the 16mm spindle. This is either due to my 3D model or the cheap calliper... an I can hopefully work that out over time.

        But yes, it is a very interesting project...

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        • #5
          Brilliant Xander

          For the last 30-40 years I have used a pair of Shinko hand rewinders that can do both 16mm and with adapter supplied Super 8 as well. I use them for all my film rewinding, never using the projectors as I prefer hand winding for those two formats.

          Your 3D printing opens up many possibilities to make projector parts as well, like guides etc.

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