3 mm dot grid paper
Three-millimetre spacing — about as fine as a dot grid can go before it stops being a guide and becomes a texture.
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Who a fine grid is actually for
Three millimetres suits people whose natural hand is genuinely small, along with miniature and model work, detailed technical sketching, and chart-like layouts where you want a great many rows on a single page. Most handwriting occupies three rows here rather than the two it takes at 5 mm, so the grid guides the line without dictating the letter height.
Dot weight is critical at this density
At 3 mm there are nearly three times as many dots per unit area as at 5 mm, so any excess weight multiplies across the page. Keep the dot size at the low end and the colour a genuinely light grey. A weight that looks restrained at 5 mm reads as a solid grey field at 3 mm, particularly on absorbent copier paper where every dot spreads slightly into the fibres.
Check your printer can resolve it
A 3 mm grid asks real accuracy of the hardware. Inkjets on plain paper spread ink and can blur round dots into ovals; older lasers may drop the palest greys entirely and leave gaps in the field. Print one sheet and look at it closely before committing to a stack. If the dots come out inconsistent, raise the weight slightly rather than opening the spacing — patchy dots are worse than heavy ones.
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.