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Have just printed over the last couple of weeks the 25mm OD parts which I notice have the letter F on the printed parts. I have measured a few of my printed parts with my digital vernier and it appears that these parts are for the 23.5mm OD tube. In the UK so mm and I've checked my tubing and its 25mm OD. I have double checked and the downloaded folder from Thingiverse is Mostly_Printed_CNC_525__F-25mmOD
Is there an issue with the F marked parts? Best Wishes Jim