October BOTM: Ribbon Block

The October BOTM is the Ribbon Block. It has a fun pinwheel design that would be perfect for a tailgating quilt (or a Spring picnic quilt if you are more of a procrastinating quilter). It is a great block for beginners since it is made by combining a square and half square triangles.

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Last month, we showed how to make two half square triangle squares at a time, but this month we will use the method for making 8 at a time.  

All seam allowances are ¼”. The finished block will be 9” so that it will fit with all of your other Stash Builder Box Blocks of the Month.

Cutting Instructions

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Cut 1- 8 ¼” square from Fabric A. From Fabric B, cut 1-8 ¼” square and 1-3 ½” square.

Assembly Instructions

1. Draw diagonal lines from corner to corner on the wrong side of one of the 8 ¼” squares.


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2. Place the marked block on top of the other 8 ¼” square.

3. Stitch a line ¼” from the line you drew. Do this on both sides of each line.

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4. Place the 8 ¼” squares on a cutting mat and turn it so that the drawn lines form an “X.”  Use a ruler to measure from the edge of the squares to the center point (4 ⅛”). Cut along the edge of the ruler.

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5. Turn the squares 90 degrees and repeat step 4. You will now have 4 squares that measure 4 ⅛” x 4 ⅛”.

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6. Cut along the drawn lines of each square to create 8 half square triangle (HST) squares.

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7. Open each HST square and press to the dark side.

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8. Trim to 3 ½”x 3 ½”.

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9. Arrange the HST squares and the 3 ½” square you cut earlier according to the photo below.

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10. Assemble the rows and press. Press the top and bottom rows toward the outside and the middle row to the inside so that the seams will nest.

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11. Stitch the rows together. Press the block, and trim to 9”x9”.

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You’ve now completed the Ribbon Block. Don’t forget to post photos of your completed blocks using #BOTMSBB and tag Stash Builder Box. Your block might just be featured!