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Twelve-Bobbin Thread-Tail Storage Tray
A 126 x 96 x 14.5 mm tray with twelve wells, each 26 mm across and 12.5 mm deep. Each well holds one sewing-machine bobbin up to 25 mm in diameter and 12 mm tall, such as a Class 15 (about 20.5 x 11.7 mm), Class 66 or L-style. A 12 mm finger trench runs along each row so you can pinch a bobbin out from the sides, and each well has a 2 mm angled slot to hold the thread tail so wound bobbins stay tidy and don't unravel.
NEMA 17 Three-Motor Storage Tray
A 146 x 62 x 12 mm bench or drawer tray that holds three spare NEMA 17 steppers upright on their backs, each in a 43.3 mm square pocket that fits the 42.3 mm motor body. The shafts stay pointing up and out of the way. A 24 mm push-up hole under each motor and finger notches in the walls make them easy to lift out, and a 9.5 mm trough along the front holds the M3 screws, pulleys and couplers that go with them.