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Don't know if this tip is of any use to the multitude of people printing this great model, but first time I tried to glue the flat strip into the nozzle I made a real mess of it. I was using Gorilla super glue, which did work, but I really struggled at the pointed end keeping the strip in place while the glue set and ended up (like I always do with super glue) sticking my fingers to the nozzle and it ended up with white blotches all over the black nozzle.

2nd attempt I tried to get the strip to maintain the spiral shape before gluing. So I laid the strip dry without glue in the groove and secured at both ends with masking tape. I did need to cut about 2 mm off one end for a good fit (not sure why). I then put the whole thing in very hot water (around 80 C) in a cup and left it until the water went cold. To my surprise the strip was perfectly in the groove, even when tape removed. After 5 days it was still perfectly in there, still no glue, however, as a precaution I have just put a dab of glue at both ends.