Quick answer
For most quilters, start with the Sew Square 4 for trimming curved units up to 4" and the QCR Mini for piecing curves on smaller blocks. If you work on larger quilts or bigger blocks, the Sew Square 6 gives you more trimming capacity. Your ruler choice should match the block size in your pattern.
Sew Square 6
How ruler size affects your piecing
Sew Kind of Wonderful rulers are designed to work with their signature "cut, sew, and square up" curved piecing method. The ruler size determines the maximum block dimension you can trim accurately. A smaller ruler like the QCR Mini is ideal for mini quilts and small projects (up to 28" x 38" finished), while larger rulers like the Sew Square 6 handle blocks up to 6" for bigger quilts like the Park Place Quilt Pattern (55" x 63").
If you plan to make a variety of projects, owning both a small and a medium ruler gives you flexibility. The QCR Mini is included in the Posh Santa Combo, which also includes the Sew Square 4, making it a convenient starter set for holiday and small quilts.
Understanding the trade-offs
A larger ruler (Sew Square 6) lets you trim bigger blocks but can feel bulky for small pieces. A smaller ruler (QCR Mini) is nimble for precise curves on tiny patches but won't square up a 6" block. If you only make small projects, the Sew Square 4 plus QCR Mini covers most needs. If you make bed-sized quilts, the Sew Square 6 saves time by trimming in fewer passes.
Decision rules for choosing your ruler
- Project size: If your pattern finishes at 28" x 38" or smaller (like Posh Holly or Posh Santa), the QCR Mini and Sew Square 4 are sufficient. For larger quilts like Park Place (55" x 63"), consider the Sew Square 6. Match ruler size to finished quilt dimensions.
- Block complexity: Patterns with many small curved pieces (e.g., scrappy quilts with 6" blocks) benefit from a ruler that matches the block size. The Sew Square 4 handles most blocks; the Sew Square 6 is better for blocks over 4". Larger blocks need larger rulers for fewer trimming steps.
- Budget and versatility: The Posh Santa Combo includes the QCR Mini and Sew Square 4 at a bundle price, giving you two essential rulers for small to medium projects. Buying separately may cost more. Bundles offer savings if you plan to make multiple project sizes.
Rulers in action: what the patterns reveal
- Posh Penelope (Paper): Posh Penelope is a fun scrappy quilt that combines curves with on point sashing and cornerstones. Materials include 6-1/2" x 6-3/4" focus fabrics and 5" x 10" background fabrics. This pattern uses larger fabric pieces, so a Sew Square 6 ruler would be more efficient for trimming the curved units. The Sew Square 4 could work but may require multiple passes.
- Posh Holly (Paper): Posh Holly is a 28" x 38" quick project using fat quarters and small cuts. It is designed to complement Posh Santa. The small finished size and fat-quarter-friendly materials make the QCR Mini and Sew Square 4 ideal for this pattern. A larger ruler would be overkill.
Which ruler fits your quilting style?
Best for
- Quilters who make small projects (wall hangings, mini quilts, holiday decor) — the QCR Mini and Sew Square 4 are ideal.
- Quilters who work on bed-sized quilts or larger blocks — the Sew Square 6 saves time and reduces trimming passes.
Not for
- Quilters who only make large quilts — the QCR Mini will be too small for trimming 6"+ blocks.
- Quilters who only make mini quilts — the Sew Square 6 is unnecessarily large and may be cumbersome.
