4 mm dot grid paper, A5
Four millimeter dot spacing on A5, one step finer than the bullet journal standard, for small handwriting.
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One millimeter matters more than it sounds
Five millimeters is the de facto standard because Leuchtturm1917 and Rhodia use it, not because it suits everyone. If you write small, 5 mm wastes vertical space and your lines float in the middle of two-square gaps. At 4 mm the same handwriting sits comfortably at two squares, and an A5 page holds roughly a third more lines. If you write large, this will feel cramped and 5 mm is the right sheet.
Denser grids want lighter dots
Going finer puts more dots on the page, and at the default weight a 4 mm grid starts to read as texture. Reduce the dot weight and lighten the color. This has a second benefit: light dots photograph and scan much better, which matters if you keep your journal digitally as well as on paper.
Check it against your notebook first
If you are printing inserts rather than loose sheets, print one page and lay it against the notebook before printing thirty. Spacing is a personal fit, and the only reliable way to know whether 4 mm suits your hand is to write a paragraph on it. The 3 mm sheet is available if even this feels roomy.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100%, not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.