I bought this to use in a 3D printer not a pen so keep that in mind. So far I have only used three colors from this set: grey, purple and orange. The last two colors are very light and go well with the toys I made the parts for. Gray is obviously just gray, but it's also a beautiful color. The prints I made came out fine, with one exception: when using gray, a piece with a long, narrow stem sticking up about half an inch turned out to be a mess. I still don't know why. The rest of this print was fine, but the shaft was destroyed. Otherwise, I'm happy with the print quality so far. I definitely noticed a difference between these coils and the black and white hatchbox coils I've used before. The thread is not that strong, which is kind of a double-edged sword. I found the supports to be very easy to remove which is great. However, about 24 hours after spending time in the printer's feeder, I found that the filament broke under its very light weight. It's happened twice now and I've learned my lesson. This has never happened to the hatchbox thread so I wasn't expecting it. Real prints seem strong, but I don't think they are that strong. So far that hasn't been a problem for me. It's important to remember that these are very short threads. The print I made with the orange was a large weapon accessory for the figure and took up about 3/4 of the entire thread strand. Finally, a note on the packaging. Each color is a small spool of thread with no spool or anything like that. They are packed in plastic bags and packed in a beautiful box. They can be put back in their bag after cutting if you're careful, so storage isn't a problem.
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