Whether you’re a seasoned sewist or just starting out, seam allowances are one of those must-know essentials that can make or break your project. But what’s the best way to measure and mark seam allowances? Today, we’re diving into the pros and cons of seam allowance discs versus seam allowance rulers to help you pick the perfect tool for your sewing toolkit!

Seam Allowance Discs

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What They Are:
Seam allowance discs are small, often magnetic, discs that attach to the side of your rotary cutter. You set them to the width you want, and as you cut around pattern edges, the disk maintains a consistent seam allowance, leaving you with an accurate cut.

Pros:

• Quick and Accurate: Discs make it easy to add seam allowances to pattern pieces on the go.

• Easy Setup: Attach the disc to your rotary cutter, adjust for width, and you’re ready to roll!

• Great for Curves: Since they move along with the cutter, discs handle curved edges effortlessly, keeping the seam allowance consistent even on more complex shapes.

Cons:

• Limited Width Options: Most discs come in set sizes (1/4”, 3/8”, 1/2”, etc.), so you’re restricted to the widths provided.

• Dependent on Cutter: If you prefer using scissors or want finer control, disks might not be ideal.

• Needs a Steady Hand: While discs are super handy, they rely on a smooth cutting motion to maintain accuracy. A shaky hand might lead to uneven lines!

Shop:

• Shop colorful seam allowance disks on Amazon here.

Seam Allowance Rulers

What They Are:
Seam allowance rulers are clear, often flexible rulers with multiple marked seam allowance widths. Some rulers feature grooves or ridges to help line up fabric edges while tracing around patterns.

Pros:

• Versatile Widths: With a seam allowance ruler, you can mark multiple widths, making it perfect for projects with varied allowances.

• Can Be Used with Scissors or Cutters: No need to be locked into one cutting tool – you can use a seam allowance ruler with your scissors for delicate work or rotary cutters for speed.

• Precise Marking: Rulers provide control over marking rather than cutting, which is ideal if you like to take your time with measurements.

Cons:

• Slower Process: Marking allowances with a ruler takes longer, especially on large or complex patterns.

• Not Great for Curves: While some rulers are more flexible, they can still be tricky to use on tight or irregular curves.

• Requires Marking: Using a ruler means you’ll need to mark your seam lines before cutting, adding an extra step.

Shop::

• Shop yellow seam allowance ruler on Amazon here.

• Shop green seam allowance ruler on Amazon here.

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Which Tool Should You Choose? 🤔

If you’re making lots of repetitive cuts or working with mostly straight or gently curved lines, seam allowance disks might be your best bet. They’re quick, efficient, and ideal for rotary cutter enthusiasts!

On the other hand, if you prefer precision marking, flexibility in seam allowance width, or if your patterns feature intricate curves, a seam allowance ruler may be more suited to your needs. They’re perfect for those who like a bit more control in the marking phase.

Quick Comparison Chart 📊

Final Thoughts 💡

Both seam allowance disks and rulers are handy in their own right. If you’re doing lots of garment sewing with repeatable patterns, seam allowance disks could save you time. If you’re into more detailed or customized projects where control is key, a seam allowance ruler gives you the flexibility and precision you need.