What is the maximum fabric thickness I can sew, and what should I avoid?
Do not sew fabric more than 6 mm (15/64 inch) thick, as the needle may bend or break. Additionally, do not push the fabric with too much force during sewing, as this can also cause the needle to bend or break. (Page 1)
From the official Brother XG4099-001 Computerized Sewing Machine manual, page 1
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