Objective: Inspect, repair, and press your finished capstone item so it meets a consistent, sellable standard a paying customer would accept.
Testing and polishing is the difference between a homemade item and a home-business product. Work through four checks in order. First, structural integrity: tug firmly on every seam and stress point (strap joins, corners, pocket tops). On the MC6650, high-stress joints should have been secured with the locking stitch (the auto-lock button) or a short backstitch; if a seam shifts or shows a gap, reinforce it. Second, thread management: trim every tail flush, and look for skipped stitches or uneven tension. The MC6650's top-thread tension dial and its automatic thread cutter help, but inspect the bobbin side too—looping on the underside means top tension is too loose. Third, measurements and symmetry: compare paired elements (sleeves, straps, hems) with a ruler; customers notice a 5mm difference. Fourth, finish and press: open or set seams with your iron, press from the wrong side to avoid shine, and use a pressing cloth on delicate fabric. A crisp press hides minor imperfections and makes topstitching look intentional. Finish by lint-rolling, checking for pins, and photographing on a clean, well-lit background. Record any recurring fault in a notes log so you can fix it at the sewing stage next time rather than the polishing stage.
Example: A maker finishes a lined zip pouch. On the tug test the zipper end seam gaps slightly, so she re-sews 2cm over it and hits the auto-lock button to secure. The underside of the topstitching shows small loops, signaling loose top tension, so she raises the dial from 3 to 4 and re-stitches one line—loops gone. She measures both sides of the pouch: 15cm vs 15.4cm, so she trims and re-presses the longer side flat. Finally she presses with a cloth, lint-rolls, and photographs it against a white board. Result: a uniform, retail-ready pouch.
Try it: Take your finished capstone item and run the four-step QC pass: (1) tug-test every seam and reinforce any that move, using the MC6650 auto-lock; (2) trim all thread tails and inspect both sides for loops or skipped stitches, adjusting top tension if needed; (3) measure at least one paired or symmetrical feature and correct any difference over 3mm; (4) press properly with a cloth and lint-roll. Write a 3-line notes log listing any fault you found and how you will prevent it during construction next time.