There are several reasons you might need one of these: 1) Making your own multicolored filaments 2) Using the mixed media associated with FDM printing. Of course, you can *buy* a spool of multicolored yarn. - colored thread. But the range of colors is limited, and a common complaint is that the color change is only noticeable when the print is large. Leftovers can be recycled, used in a 3D printed pen, or melted down in a kiln to make things like coasters. However, many people I've seen on various forums want to use them in their prints. After experimenting with my own thread splicing solution, I wanted to see what the team at VIT Sport came up with. Let's face it, this isn't a big corporation that polishes and manufactures a product. It's more like what a bunch of guys knocked out in their garage - it works, it works well, but obviously for an amateur. I'm not going to hold this against the product, just setting the right expectations. Looking around I haven't found any other off the shelf solution in this price range and it usually works better than the ones I've put together for my own use. Let's go through it quickly. You need a handy timer because there are two time steps 1) Turn it on for 2-3 minutes and then turn it off. 2) Open the clip, insert one end of the filament, and then close the clip. 3) Insert the end of the other filament into the hole on the opposite side and gently squeeze the two filaments together. 4) Wait 4-5 minutes for the device to cool down 5) Open the clip, remove the connected filament 6) Check and correct the connected thread if necessary. but a typical cycle takes about 10 minutes per connection. Pressing too hard on the filaments will cause the filaments to flow out the front and back of the device (see images) and form a pancake around them (see images). It's not a big deal, you just have to clean the filament anymore, and you also have to clean the device. If the upper and lower jaws of the device's clamp were connected without a gap and could be fixed in the closed position, this would not happen at all as the excess thread would have nowhere to go. Tips: 1) The time in steps 1 and 4 depends on the material to be joined, the ambient temperature, etc. 2) Use a bowden cable drill to make sure the thread to be connected is not too thick. 3) Cut the ends of the threads at the same time. the angle allows them to blend more easily 4) Brittle filament causes problems as it tends to break every time you grind it 5) Some filaments don't want to connect no matter what you do. When making multicolored yarn, switching to a different color often solves this problem. In any case, I was able to make multicolored threads easier and faster with this device than with my own solution. Is this the ideal solution? no It needs its own timer, a way to avoid excess filament in the splice area, temperature control options, and a way to cool down quickly. However, if you need a turnkey solution that isn't outrageously expensive, this is a good option.
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