Knitting chart paper, A3
Knitting chart paper on A3, for charts too large to fit on A4 without splitting them.
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A whole yoke on one sheet
Colorwork charts get big. A stranded yoke, an all-over Fair Isle repeat, or an intarsia panel across the front of a sweater will not fit on A4 at a cell size you can actually draw in. Splitting a chart across pages is where mistakes enter, because the join is exactly the place your eye skips. A3 holds most garment-scale charts whole.
The proportion still has to be yours
Size does not change the geometry. Cells still need to be wider than they are tall, in your own gauge ratio, or the design comes out flatter than you drew it. Enter your stitch and row counts from a blocked swatch, as described in the gauge article. A large chart makes the distortion more visible, not less, because the error is proportional.
Mark the repeat before you draw
On a chart this size it is easy to lose track of where the pattern repeat begins and ends, and a repeat that does not divide evenly into your stitch count will not become obvious until you are knitting. Rule the repeat boundaries first, count them against your cast-on, then fill in the design. The A4 sheet is the smaller version for swatches and motifs.
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.