Nema 17 Pancake Stepper Motor 20mm

Nema 17 Stepper Motor 17HS08-1004S – 20 mm, 16 Ncm

This Nema 17 stepper motor (model 17HS08-1004S) is an ideal choice for modern 3D printers with direct-drive extruders. It stands out with its extremely low weight (140 g) and short body (20 mm), which minimises the inertia of the moving parts of the print head. The lower weight helps to reduce printing artefacts (such as ghosting) and allows for higher speeds and accelerations without sacrificing quality.

The motor is designed for applications where standard Nema 17 motors (40 mm and more) are unnecessarily heavy. It is therefore popular in community and commercial extruders (e.g., Voron Clockwork, Orbiter), where every gram counts.

Key Features

• Extremely low weight: 140 g significantly reduces the load on the X and Y axes.
• Compact 'pancake' design: A 20 mm body length allows for the design of smaller and lighter print heads.
• Sufficient holding torque: 16 Ncm is fully adequate for reliable filament feeding in most geared extruders.
• Standard 1.8° step angle: Ensures compatibility and precise filament feeding.

Electrical Compatibility and Wiring

• Low rated current: 1.0 A per phase, compatible with common drivers (TMC2209, A4988), the motor does not overheat.
• Bipolar 4-wire connection: Standard layout for easy connection to most control boards.
• Sufficient cable length: 400 mm for easy connection without the need for extensions.

Technical Specifications

Comparison with a Standard Nema 17 Motor

Compared to standard Nema 17 motors (40–48 mm length, 280–350 g weight), this model is more than twice as light. This difference is crucial for the printer's dynamics – standard motors have a higher torque (usually above 40 Ncm) and are suitable for driving the axes, but their weight is a limiting factor for modern direct-drive extruders. The 17HS08-1004S model is the ideal compromise between weight and performance for this application.