Printed grid lines missing or faint? Three causes
Nine times out of ten it is print scaling, or the printer treating pale thin lines as noise. Check scaling, then print quality, then line width and colour.
1. Check the scaling
Fit-to-page shrinks the sheet to roughly 95%, and thin lines fade or vanish when the page is resampled. Set scaling to 100% / Actual size.
2. Check the print quality
Draft or toner-save modes discard pale thin lines as noise. Print once in Standard or High quality.
On an inkjet that has sat unused, a partly clogged head looks exactly like this. A nozzle check settles it.
3. Adjust line width and colour
Moving the grid from light grey to mid grey, or thickening the line past 0.2mm, makes it survive printing. If you want a very pale grid, toner-save mode is not an option.
