Just printed a test and have a few notes/comments. First, quality is great. at 0.08mm height, the threads are near ferfect. Second, just as an FYI, the normal standard when measuring countersunk/flat head screws is to measure from flat of the head to end of thread. It looks like your dimensions refer to just the thread length, which will be confusing to a lot of people, myself included. Third, the nuts are ever so slightly too small causing too tight of a fit, subsequently stripping the screw head due to over torturing. I suggest to increas nuts by 1.05 for a better fit. Lastly, your profile has all speeds and travel dropped down to 25mm/s, which would be over an hour for just one screw and nut to print. I tested at default speeds on the cool plate with brims and everything was just fine. this reduced the time to about 20 minutes for one 30mm screw and nut. Thanks for the upload. It came in handy!