3D printing from negative to positive

    When the trees were large, and there were no digital cameras yet, then everyone used ordinary film machines. These are those that are now shown to children in museums. And our parents, and their parents and so on, all used these cameras, and then showed films and printed photos. Many have accumulated rolls of these films that they did not manage to print, and now, sorting through old boxes, many want to translate these negatives, aging witnesses of history, into digital form for posterity.

    So our customer has a 3D printerfrom Kostroma it happened. He looked on the Internet several devices made of cardboard and decided to make a similar device on his own, but using a 3D printer. He designed everything himself, but there was a problem with this very ability to print. In general, he sent a letter asking him to help him solve this problem now, and how not to get into such situations with future work.





    His work, sent to us, and the entire background, of course, are published with the permission of our buyer.

    We were sent a * stl file, which was loaded into the printing program, and we saw a very thin rectangular hole. We read further the letter and understand the purpose of this hole and the whole structure in general, and then we delve into its problem and understand that in this version we cannot do without supports, and they clog this gap from it.

    In the photo below you can see the detail. It is simple at first glance, but when it comes to supports, where small details always cause problems. Therefore, we try to make various of our details in the style of "no support". And we save plastic and time for peeling.



    The source code was sent to us, we cut it into sections, designed a spike and a groove for pairing the two halves, as well as protrusions that prevent vertical displacement.
    The detail turned out asymmetric, but when printing two copies, they should perfectly combine.



    Everything is printed without supports, and the halves of the cases are printed horizontally so that the spike and groove face up. The total weight of about 35-40 grams of plastic and 2 hours of printer operation. When assembling, if the SHIP does not enter the groove, then for it to enter, it (the spike) must be scraped off (it can be with the tip of the clerical knife) along the entire length on both sides, so that it decreases in thickness so that it goes into effortlessly groove. Then we put on a ring, and on top we put on an extension cord that fixes two halves on top and raises the lens to the minimum required height of the “macro mode”. The external diameter of our model is 50 mm, so if you want to make your own extension cord, you can focus on this size and make the internal diameter of the extension cord 50.2 mm.



    Assembling the device case is a crucial moment. It is important to take packaging from quality ABS or PLA plastic, as Only high-quality plastic has high-quality cardboard packaging :)

    We mark the place where the light from the lamp will pass and cut it out. Please note, in our case, we cut the bottom. Next, we lay a sheet of white paper for dispersion and try on a light bulb (here E14, 10 watts) with a cartridge and a wire. The wire with the plug in this design is from IKEA.



    Since we have a holder with a holder, we cut a cover under it and secured it due to this, and between it and the cardboard we laid tin from a can for dissipating heat from the lamp.

    Everything, the assembly is completed, you can try.



    This NEGATIVE turned out to be completely random, because we don’t have any films in our office, and it was this negative that someone recently showed to someone as a relic from the past, that’s how he waited for it to be used.

    After that, any graphic program is used where there is an INVERT COLOR or MAKE NEGATIVE mode, etc. We used the free program PAINT.NET from the getpaint.net project site.



    Good luck in handling NEGATIVE to POSITIVE, and you can take all the details stl on our site :) And you could also make a model of a different shape to do without cutting and supports, but we asked to make it possible to collect such a nominal geometry.

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