RapidChange Revo Support


Revo Six/ MK3


Revo Micro/Mini


Revo CR/ Sprite


Revo Voron


Revo Hemera XS


Revo Roto

Revo Hemera XS Summary

  • Drive Type: dual drive with adjustable tension idler
  • Max Printing Temperature: 300°C
  • Nominal steps per mm (x16): 397
  • Recommended current: 1.4A Peak (~0.99 RMS)
  • Filament diameter: 1.75mm

Service Temperatures

Note, these are maximum ambient service temperatures of the components used and not a guaranteed operating temperature of the system

  • Fan: 50°C
  • Motor: 85°C
  • Polymer bushing: 90°C
  • Bearings: 100°C
  • Acetal idler components: 120°C

Fan Specification (Direct)

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  • Width: 40mm
  • Depth: 10mm
  • Cable: 1000mm
  • Bearings: 100°C
  • Voltage: 12VDC and 24VDC
  • Current: 0.08A (12V) and 0.04A (24V)
  • RPMS: 7500±10% (12V) and 6900±10% (24V)
  • Speed: 7000RPM
  • Connector: Dupont 0.1”
  • Startup voltage: 6 VDC (12V) and 12VDC (24V)Airflow: 6.8 CFM
  • Static Pressure: 4.55 mmH20
  • Noise level: 33.6 dBA
  • Weight: 14g

Motor Specifications & Diagrams

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  • Motor mass: 160 g
  • Motor wire length: 1000mm
  • Phase number: 2 phases
  • Rated voltage: 3.22 VDC
  • Recommended Current: 1.40A Peak (~0.99A RMS)
  • Resistance: 2.3Ω per phase
  • Holding torque: 180mNm
  • Detent torque: 10 mNm
  • Rotate direction: ABĀB̅ CW
  • Step angle: 1.8°
  • Rotor inertia: 7 gcm²
  • Rotor inertia: 24.3gcm²


  • Do not remove the grease from the drive gears
  • Use a brush or compressed air to dislodge filament debris from hobb teeth
  • Avoid using wire brushes on the hobb teeth or gears.


  • Heatsink: die cast aluminium (Direct)
  • Extruder cover: MJF Nylon (Bowden)
  • Gear/Hobb materials: stainless steel
  • Fixings: steel
  • Idler materials: Acetal
  • Bearing elements: 2x shielded 623 bearings (drive shaft), Igus bushing.

Mounting Guidance


Hemera is mounted to a flat surface via the T-slots on the left or right sides of the motor. Typically Hemera is mounted onto the left side, as the air from the heatsink cooling fan exits on the right. If mounting on the right, ensure that sufficient space is left for airflow.

The screws must protrude 3mm±0.25mm from the mounting surface to go into the T-slots. The supplied M3×8 mounting screws are suitable for a nominal 5mm mounting plate thickness. Hemera must be mounted on a minimum of 2 mounting points, if using 2 mounting points, diagonally opposing points should be used, in order to ensure rigidity.

Exploded View

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Revo Six

Revo CR

Revo Micro 

Revo Hemera XS

Revo Hemera

Revo Voron

Revo Nozzles

Revo Open Coldside