D19L25 aluminium Zaxis flexible coupling - Function and design: a shaft coupling for stepper motors, serving as a connector between two shafts in the Z axis. It is a single piece made of aluminium and is offered in multiple shaft sizes. - Sizes available: 3 mm, 4 mm, 5 mm, 6 mm, 6.35 mm, 8 mm, and 10 mm. - Footprint and material: single piece with 8 x 8 dimensions, made from aluminium for solid performance in the Z axis. - Performance: provides flexibility in the Z axis to enable smooth transmission of power from the motor to the driven shaft. - Compatibility: specifically designed for 3D printers and stepper motor shaft connections; suitable for standard printer configurations requiring shaft-to-shaft coupling. - Benefits: reliable shaft connection, enables precise power transfer, and supports various common shaft sizes with a single piece design. - Use scenarios: 1) In a 3D printer, connect the stepper motor shaft to the Z axis driven shaft using the correct size to ensure proper shaft coupling. 2) In a DIY printer rebuild, select the appropriate diameter from the available sizes to mate different shaft configurations. 3) Keep as a spare part in a service kit for routine 3D printer maintenance and quick replacements.