Isometric dot paper
The same triangular lattice as isometric graph paper, marked with dots instead of lines. Your drawing dominates the page instead of competing with the grid.
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When dots beat lines
Continuous isometric lines are useful while you are constructing a shape and a nuisance once it is drawn — they read through the finished sketch and make it hard to photograph or scan cleanly. Dots give you the same alignment cues but disappear behind ink. Most people who draw isometrically regularly end up preferring dots.
The lattice geometry
Rows are spaced at √3/2 of the dot pitch and every other row is offset by half a pitch, which puts every dot at the vertex of an equilateral triangle. That means you can draw at 0°, 60° and 120°, or connect verticals through alternating rows.
A note on density
Because the rows are closer together than the columns, isometric dots look denser than a square dot grid at the same nominal spacing. If a 5 mm isometric field feels busy, try 6 or 7 mm — it will read closer to how a 5 mm square dot grid looks.
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.