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I'm using the Sampling generator and has you can see, for some reason, the little branches have these holes at the tips, why is that? And how can I get rid of them?

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Use the Minimum Radius property under Branch Radius category to control the branch tip diameter while crating a new sapling tree.

You can also tick the option Close Tip as mentioned by Akados in the comments.

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If you already created one then enter edit mode and select all branch tips and adjust their size with the Bezier Curve Radius property from the Properties Shelf Alt + S. You may want to turn on Proportional Editing

To easily select all tips you may use the Select Grouped operator with Shift + G and try to select by Radius.

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    $\begingroup$ You could also check 'Close Tip'. $\endgroup$ – Akados Dec 21 '17 at 19:00
  • $\begingroup$ Indeed, good tip, I'll add it to the answer. Thanks for the comment $\endgroup$ – Duarte Farrajota Ramos Dec 21 '17 at 19:05
  • $\begingroup$ Thank you for this. I somehow missed those options, but I do find the sappling generator a bit confusing, due to all the many sliders and whatnot. :P $\endgroup$ – Pherion Dec 23 '17 at 23:45
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First choose all vertices in Edit Mode and press F to fill holes with faces.

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