Calibrate your printout (simple 3‑step)

1. Print the calibration sheet at Actual size (100%) with “Fit/Scale” turned off.
2. With a trusted ruler, measure the 100 mm bar or check which row of squares matches real millimeters best.
3. Enter that value as your sitewide scale (e.g., 1.03 or 1.04) and save. All grid widgets will use it by default.

Tip: If your print is slightly small, try a scale like 1.03. If it’s slightly large, try 0.98. You can revisit and update this anytime.