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€1
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€0.50
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€14
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VEND - the totally printed candy dispenser
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€1.93
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€5.02
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€3.43
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22
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One "simple" project.
Greetings, colleagues!
I present to you a small "simple" project that I started in order to please my friends and acquaintances for the New Year.
New Year's gifts are always a sore subject, souvenirs, magnets, postcards, etc. often sent to the urn the week after the holiday.
Therefore, I decided to print a souvenir - a personalized "lucky" coin with the symbolism of the year of the rat-mouse, the name of the recipient and an indication of who the donor is. I already posted the model - https://3dtoday.ru/3d-models/style-and-fashion/accessories/suvenir-schastlivaya-moneta.
Modeled in my favorite autocad. True, I originally planned a diameter of 50-55mm, but then I realized that this size was too big for a coin, and reduced it to 37.5 mm, so some of the modeled details of the “mice” (teeth, claws) became clearly unprintable.
Fig.1. Model render and printed model. before painting, the remnants of supports are not removed.
I have been printing for more than a year, I have seen a lot of 3DSLA cubes ... so I roughly understand what and how the printer is able to print.
Unfortunately, the 3DSLA cube does not reflect the whole variety of situations with the printing of real products, and, for example, blind holes and slots in reality “float” much more than through slots in the cube ... but nevertheless, cube tests are what you can push off when modeling. Without them, I cannot understand what is printed and what is not.
Embedded text is a difficult place to print - as I said above, blind holes swim more strongly, and it is more difficult to wash the photopolymer out of them. A meaningful text is also complicated by the fact that it must be readable - if a meaningless ornament is damaged or partially swum, no one will notice, and an unreadable text will immediately catch your eye.
In addition to the text - the tail and eyes of the mouse. They attract attention and are small in size.
In general, when modeling, I proceeded from the fact that the model was “printable” with any red or black photopolymer.
Since I planned to paint the photopolymer with white metallic, and here are my own pitfalls - a thick layer of metallic hides the relief and looks bad, and a black polymer “peeps” through a thin one - which is not very good.
Ideal for metallic paint - light gray.
But when printing with a light photopolymer, there is a risk that the text will not be printed, the eyes will not be printed, the tail will swim - light photopolymers usually do not have good "sharpness", but there are exceptions.
Therefore, I consulted an artist-guru of artistic printing, who did not print anything and for whom and claimed that printability is determined by eye without tests and cubes. I asked to evaluate the “printability” of the project with a skin-colored polymer unfamiliar to me (flesh-colored to light gray can always be brought with pigments, the sharpness will only increase). His answer was discouraging - “the project is simple, everything will be printed” - from an artistic point of view, it may be simple, but I asked you to evaluate printability! And in this regard, the project is called "simple"? On the offer to print for testing - "merged" in the most boorish way.
In order not to take risks and not waste time on experiments, I had to print with almost black polymer.
The ratio of Hardlight pigments black and white is 4 to 1. So that it is not completely black, but “sharp” enough.
Fig.2. Embedded text with lines less than 1 mm wide. It printed fine.
Fig.3. The tail... Printed even better than I thought.
Fig.4. Eyes and teeth ... The eyes were printed normally, the teeth were barely outlined. It is clearly seen that the pixel moire does not worsen the perception of the relief.
Fig.5. The claws… were developed for a coin with a diameter of 55 mm, respectively - for a coin of 37.5 mm - non-printable… but something, nevertheless, was printed.
Double-sided coin, such a coin can only be printed vertically “on the edge” - the bottom side is always poorly printed, well, the supports will ruin everything. And yes - the supports spoil the bottom edge a lot. Here it was necessary to experiment with supports - it was quite possible to model something so as not to spoil the edge of the coin, but I managed with the standard ones in ChiTu, and simply processed the edge with a file and sandpaper.
Next, there is another problem - "sharp" polymers emphasize layering and pixel structure, which does not always look good. So when printing, I rotated the coin at an angle of 14 degrees to the axis when printing - so that the borders of the pixels form a series of horizontal stripes on the coin - to bring the coin to life. As a result, an interesting game of pixel lines appeared on the coin, and the pixel grid became not a disadvantage, but an advantage of the print.
Printed 5..6…7 coins at a time. It printed well - you can see both the eyes and the tail, and even a little teeth and claws are visible. I planned to paint over the text and background in red - but I did not have time. Most of the coins and varnished, without red. But pure metallic looks good too.
With metallic, I really missed a bit - I took KUDO chrome. And it is a little grayish, and the gray color intensifies with varnishing ... Was it necessary to have something more white - silver? Alas, I'm not good with metal.
But on the whole it turned out okay.
Fig. 6. I planned to paint the coin, but there was no time - most of them were only “blown out” with metallic and lacquered.
For those who want to repeat a similar project, I inform you that the thickness of the 3.8mm edge was chosen based on the ability to print with polymers with ordinary mechanical properties (hard and brittle), when using non-brittle polymers from Hardlight or any "Chinese" ( I don’t like and don’t understand Chinese photopolymers, but among them there are excellent polymers in terms of mechanical properties) - the thickness can be reduced to 2 mm or a little less, respectively, the diameter of the coin can also be reduced - flat coins 28 ... 33 mm in size will look better.
Well, for those who want to repeat such projects on a paid basis, a few data to assess the profitability:
1. With the finished template, simulate an inscription with the name and from whom - business for no more than 15 minutes.
2. With group printing, the time spent is 0.5..1 hour per coin.
3. If you don't bother with painting the text and background, the time spent on washing, separating from the supports, “blowing out” with metallic and varnishing is half an hour, maximum an hour per coin.
4. Weight - approximately 5 grams with a diameter of 37.5 mm and a edge thickness of 3.8 mm.
Given the cost and creepy appearance of similar "coins" and "medals" in souvenir shops - success and effective demand is very likely, commercial effectiveness - not sure.
That's all for now!
Successful prints in the coming year!
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