Bullet-journal dots at true spacing, in the size your notebook actually is. The usual reason to print your own is that you want A5 or a planner insert rather than Letter, and that is exactly what most sites will not give you.
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| Spacing | Any |
|---|---|
| Dot size | 0.2–1.6 mm |
| Paper sizes | 18 |
Choose Print, then pick Save as PDF as the destination if you want a file. Set scale to 100% and margins to None — the sheet already carries its exact paper size, so the browser must not rescale it. Anything else and the dimensions you chose are no longer the dimensions on the page.
Usually 5 mm. That is the default here.
Yes — Classic, A5, Personal and Pocket are all available.