The instructions for this filament state that the filament is to be fed directly into the extruder before use. I had trouble plugging in the extruder. Yesterday I tried to push the filament into the extruder. What emerged was a thick strand of extruded filament twice the normal diameter (top filament in photo). It seems to have cleaned the print nozzle. Since then I've made several prints with no gags. They make objects that look and feel good but are very difficult to stick to the build plate. It seems to shrink and deform. I'm only giving it four stars because of liability issues.
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