S3M Black Rubber Synchronous Belt, Ring Closed, model S3M300, is a timing belt designed for precise positive drive in 3D printers and other beltdriven equipment. The closed loop belt provides reliable tooth engagement and consistent motion around the circumference of 123396 mm, with a width of 15 mm. Key benefits Positive drive and reduced belt slip: as a synchronous belt, it maintains synchronized motion between pulleys for accurate positioning. Durable closedloop design: a ring closed belt simplifies installation and provides continuous drive without joints or gaps. Robust width for higher load transmission: 15 mm width supports stable power transfer in moderateload applications. Consistent performance in 3D printing setups: suitable for use in 3D printer drives that require S3M300 width15 mm belts. Simple replacement and maintenance: compatible with standard S3M300 configurations, enabling straightforward belt replacement. Key attributes Functionality: black rubber synchronous belt, ring closed, for positive timing transmission. Compatibility: S3M belt family; ring closed configuration; model S3M300; width 15 mm. Size: circumference 123396 mm; width 15 mm. Material: black rubber. Performance: designed to deliver reliable timing engagement for precise motion control in compatible devices. Use cases Replacing a worn or stretched belt on a 3D printer that uses S3M300, 15 mm wide timing belt with a closed loop. Building or upgrading a beltdriven axis in a small CNC machine or robotics project that requires a closed, 15 mm wide S3M belt. Keeping a spare closedloop timing belt on hand for maintenance in educational kits or workshop setups using S3M300 specifications.