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maybe we can print rainbow lines on a big size paper, and then tape ribbon shapes out of it.
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i think you better apply maximum number of just 2 layers of paint at the end of the process. according to my experience using a fan will help environment dust to sit on the sticky painted surface and is not the best idea. for this you can make an small clear room besides to fan to achieve better quality.
it depends on layer height, the part shape and geometry and the quality you need to reach. but it's somewhere between 2-5 layers of filler.
no. the strength won't be affected. this method sinters a thin layer. remember this kind of paint is not designed to be strong. but i can say it might have an amount of surface hardness if dried well. i tried this method with primer and paint.
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