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Lobster, they are very tough! Are your 8mm OD or ID? An 8mm ID wouldn't be bad, I am holding an 11mm OD arm and the ID is about 9.5mm and I think it would work fine. If the 8mm arm was OD though it just looks really small. Let me know and I can easily post a design to your specs. As far as saving printing time, that was my thought exactly, I'm pretty sure it will also be lighter and stronger. I think I may try and figure out how to use thingiverse's customizer so that people can print out whatever diameter mounts and spacers that they need. I have found that CF tubes tend to vary a lot between manufacturers.