Quick answer
Use the Wonder Curve Ruler to cut and piece curved blocks by aligning its colored lines with your fabric edges, then sew a consistent quarter-inch seam along the curve.
Why the colored lines matter
The Wonder Curve Ruler has three bold colored lines that help you scale blocks larger or smaller without guesswork. Each line corresponds to a different seam allowance or block size, so you can adjust your project just by aligning fabric to a different line.
Common curved piecing challenges
Curved seams can stretch or pucker if you rush. The ruler's markings reduce that risk by giving you clear reference points, but you still need to handle the fabric gently and pin strategically.
How to use the Wonder Curve Ruler
- 1. Prepare your fabric: Cut two fabric squares slightly larger than your desired block size. Press them flat with no wrinkles. A common mistake is skipping the press; wrinkles cause inaccurate cuts.
- 2. Align the ruler: Place the Wonder Curve Ruler on your fabric with the colored line of your choice matching the fabric edge. For a standard curve, use the middle line. Double-check that the ruler does not shift; use a non-slip grip if needed.
- 3. Cut the curve: Using a rotary cutter, cut along the curved edge of the ruler. Keep the blade against the ruler for a clean cut. A dull blade can drag the fabric and distort the curve.
- 4. Pair the pieces: Take one convex and one concave piece. Place them right sides together, matching the cut edges. Pin at the center and ends first, then add pins every inch. Pinning too few points leads to shifting; too many can distort the fabric.
- 5. Sew the seam: Sew a consistent quarter-inch seam along the curve, removing pins as you go. Use a slow, steady speed. Rushing causes puckers; a walking foot helps feed both layers evenly.
- 6. Press the seam: Press the seam toward the darker fabric or open, depending on your pattern. Use steam to set the curve. Do not iron back and forth—it can stretch the curve out of shape.
What you need
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Wonder Curve Ruler™: The Wonder Curve Ruler is a 6" x 10" piecing ruler with colored lines and markings that make it simple to create curved blocks used repeatedly in WCR Patterns. The colored lines let you quickly scale blocks and maintain consistent seam allowances without measuring each time.
Wonder Curve Ruler™
