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Well, the file is still Allright. The reason why the pegs fit tightly in only one of the sides is as I described above. When I designed the hole for the pegs I kept in mind that most printers such as mine have an x/y-inaccuracy of about.0.2 mm. I guess your printer is just a bit too precise at printing so there is a microscopical gap between barrels and pegs when everything is printed perfectly fine on the top side of the barrels. I recommend to simply put in some glue into that hole.