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measured out the pieces and it is 3 mm, so i did print out the right part. was playing around with the tubing and depending on how i turned it around it did flow better on some part then others, so i may just pas thru the hols with a file to eat up the sides a bit fo give it a better flow. But i did found that the nut trap fo the 25mm tubing is to big, it actually reflects the OD of the tubing and dose not fit inside :) I could cut off the ends or scale it down, but by how much. Did any body else refer to this issue?