Blank guitar scale diagrams
Fretboard boxes eight frets deep, three across a page — enough room to plot a full scale position rather than a chord shape.
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Bigger boxes for scale shapes
A chord diagram needs four or five frets. A scale shape needs six to eight, because a position covers four frets of stretch plus the shifts on either side of it. Three eight-fret diagrams across a page gives boxes large enough to plot a complete pentatonic or modal shape with a mark on every note, and still leave room to write beside them.
Mark the roots, not just the notes
A scale diagram with every note drawn identically is close to useless. What makes a shape transferable is knowing where the root sits, because that is what tells you which key you are in once you move the shape up the neck. Use a distinct mark for roots — filled against hollow is the usual convention — and write the fret number beside the nut so the position is unambiguous.
Five shapes, one page
The CAGED system divides the major scale into five overlapping positions that between them cover the whole neck. Print one sheet, put all five shapes on it in order, and mark where each one overlaps the next. Learning them as a connected map rather than as five isolated boxes is the difference between playing a shape and playing the fretboard.
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.