Make a solid mount to from your stepper or servo motor to the gearbox. This motor mount has 4 openings so you can assemble the shaft coupler. Made from billet 6061 this mount is a one-piece machined part. Light weight, strong and makes assembly easy. The standard face mount for a NEMA17 motor is used to make a precise and concentric register.
The gearbox should mount to a hard surface, the motor can be mounted in a concentric and rigid manner.
With a weight of less than 60 grams, your project will stay lightweight, strong and aligned. MOTOR MOUNT ONLY