Here are my results from some different ratios of the Yellow and Purple Silk filament, I did a cylinder and more complex vase for each and have the prime wipe showing how the look as they are laid down.
1/8 purple - Just a kind of light sheen of the purple making it almost iridescent, the silk make it very shiny on the purple side facing the camera
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1/4 - This seemed like a better mix, the purple is actually visible but not it's full color still.
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1/2 - These both stayed aligned for almost the entire print except for the beginning of the cylinder where it did 180* flip for some reason.
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It really worked well for the 2-sided effect this time, I think the guide block will be interesting if it works though, it would be really cool to see it controlled. I suspect the commercial filament doesn't spiral as badly by being tightly wound on the spool but I'm going to have to order some to find out.
Yellow side:
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Purple Side:
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One thing that I noticed with the silk filament is that it applies more tension than the regular PLA. I don't remember what that effect is called but silk filaments will warp and shrink in length while getting wider if you let them extrude out of the nozzle in the air. if the print isn't getting adhesion it was enough to pull the filament in towards the purple side.
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