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I needed to replace the end plugs on my mountain bike grips and couldn't find anything on line that either I liked, or would fit... so I made my own. This will fit a tube with an approximate internal diameter of 19mm. Make it with TPU, and yes, you will need supports. But don't worry, the areas of support won't show once installed. I recommend modifying your support settings to make it a bit easier to remove. In Bambu Studio set: Tree, Support Critical Regions Only, Top Z distance 0.4, Top interface layer 0, Interface pattern Concentric, or whatever is equivalent in your slicer. Or leave the defaults and do the best you can with some small needle nose pliers. Again, it's not going to show, so no big deal. If you need a larger total outside diameter, just scale it in your slicer. There's enough flexibility that they should fit regardless.