Objective: Sew, press, and square a single 12-1/2-inch four-patch quilt block using correct MC8200 settings so it meets resale quality standards.
A four-patch block is the ideal first project because it uses only straight seams and teaches the single most important skill in quilt-for-resale work: a consistent, accurate quarter-inch seam. On the MC8200, attach the 1/4-inch foot (O), set a straight stitch, stitch length 2.0mm, and turn on needle-down so fabric doesn't shift when you pause. Lower the feed-dog pressure is not needed here; keep the dual feed off for simple piecing or on if you want extra grip. The math for resale accuracy: you cut four 6-1/2-inch squares. After sewing them with a 1/4-inch seam allowance, each finished square becomes 6 inches, and the assembled block measures 12-1/2 inches unfinished (12 inches finished once set into a quilt). If your seams drift to 3/8 inch, the block shrinks and won't match your pattern or other blocks buyers expect to line up. Chain-piecing (feeding pairs one after another without cutting thread) saves time and thread when you scale to batches. Pressing matters as much as sewing: press seams to one side toward the darker fabric so they don't show through, and press the center seam in opposing directions so the block lies flat and the center intersection 'nests' crisply. Finally, square the block with a ruler and rotary cutter to exactly 12-1/2 inches; resale buyers reject wavy or off-size blocks.
Example: Cut two light and two dark 6-1/2-inch squares. Place one light and one dark right sides together, align the raw edge with the right edge of the 1/4-inch foot, and sew at 2.0mm with needle-down. Repeat with the other pair (chain-piece: feed the second pair right behind the first, then snip them apart). You now have two rows. Press each row's seam toward the dark square. Lay the rows so lights and darks alternate (dark-light / light-dark), flip right sides together, and because the seams were pressed opposite ways they nest tightly; sew the center seam. Press the center seam open or to one side. Measure: it should be 12-1/2 inches square. Trim any excess to hit that number exactly.
Try it: Make one four-patch block: cut four 6-1/2-inch squares (two light, two dark), set the MC8200 to the 1/4-inch foot, 2.0mm straight stitch, needle-down. Sew two pairs by chain-piecing, press seams toward the dark, nest and sew the rows together, press the center, then measure and square to 12-1/2 inches. Record your finished measurement.