E3D Help Centre

Roto Support: Revo Roto MK3

Table of Contents

Summary

  • Drive type: Dual drive
  • Mass: 140g (157g including Revo hotside and nozzle)
  • Nominal steps per mm (16x microstepping): 2682
  • Rotation distance (including the gear ratio): 26.8937
  • Extrusion force: 70N+
  • Gear ratio: 11.262:1
  • Minimum recommended current: 0.45A Peak (0.318A RMS)
  • Maximum current: 0.6A Peak (0.424A RMS)
  • Temperature sensor type: Thermistor, Semitec 104NT-4-R025H42G
  • Motor voltage: 24V
  • Fan voltage: 5V (12V/24V regulator boards available)
  • Filament Diameter: 1.75mm

Performance Characteristics

  • Maximum ambient printing temperature (PLA): 40°C

Service Temperatures

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

  • Fan: 70°C (ambient temperature)
  • Motor: 80°C (surface temperature)
  • Gearbox: 85°C (surface temperature)
  • Idler: 85°C (ambient temperature)

Fan Specification

2 wire fan

  • Wire Length: 130mm
  • Rated Voltage: 5 VDC
  • Rated Current: 0.14 A + 10% Max
  • Noise Level: 33.6 dB (A)
  • Weight: 7g
  • Black Wire: Ground
  • Red Wire: Positive

3 wire fan

  • Wire Length: 130mm
  • Rated Voltage: 5 VDC
  • Rated Current: 0.14 A + 10% Max
  • Noise Level: 33.6 dB (A)
  • Weight: 7g
  • Black Wire: Ground
  • Red Wire: Positive

Motor Specification & Diagrams

  • Motor mass: 50 g
  • Motor wire length: 40mm
  • Phase number: 2 phases
  • Rated voltage: 4.5 VDC
  • Minimum recommended motor current: 0.45A Peak (0.318A RMS). Do not exceed 0.6A Peak (0.424A RMS).
  • Resistance (20 °C): 7.5±10% Ω / Phase
  • Holding torque: 75 mNm
  • Detent torque: 5 mNm
  • Rotate direction: ABCDA CW
  • Step angle: 0.9°
  • Rotor inertia: 7 gcm²

Heatsink Thermistor

  • Cartridge length: 10mm
  • Cartridge diameter: 3mm
  • Thermistor wire length: 70mm
  • Temperature sensor type: Thermistor, Semitec 104NT-4-R025H42G

Filament Sensor

  • Weight ≈ 14.4g
  • Connector: JST SH SM04B-SRSS-TB(LF)(SN)
  • Filament runout sensor
  • Programmable action button
  • Bi-color LED to show status:
    • Red - no filament detected
    • No Light - filament present
    • Blue - action button is pressed

Filament Sensor Wiring

  • Green wire - Action Button
  • Blue Wire - Filament Sensor
  • Red - VCC (3.3V-5V)
  • Black - GND

Maintenance

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

Materials

  • Heatsink: Aluminium
  • Gearbox: Steel, POM
  • Idler: POM
  • Bushings: Oilite
  • Fixings: Steel

Volumes & Dimensions

Roto

Roto Sensored

Roto Bowden

Assembly Guide

Your upgrade kit will have the following components:

  • 1 x Roto extruder assembly
  • 1 x Roto fixings kit
  • 1 x 3 or 2-wire 5V fan.
  • 1 x filament sensor (Optional)
  • 1 x Heatsink thermistor (Optional)
  • 1 x Bowdapter (Optional)
  • 1 x Extension cable kit

During this upgrade, you will need:

  • 1 x 2.0mm hex key
  • 1 x 1.5mm hex key
  • Identify the M3x30 screw holding the heatsink, and unscrew it using a 2.0mm hex key.

  • Keep the screw for later usage.
  • Carefully detach the Roto heatsink from the gearbox.

  • Place the filament sensor in its allocated place on the heatsink. (skip if using standard or Bowden variants)

  • Be mindful of the orientation!
  • Identify the heatsink thermistor, and insert it all the way in its allocated place. (skip if using standard or Bowden variants)

  • Secure the heatsink's thermistor by tightening the M3x3 grub screw

  • Reattach the heatsink. Make sure that the heatsink is flush with the gearbox and there is no gap between them.

  • If the gap between the heatsink and the gearbox still exists, make sure that the gears are well alligned!
  • Secure the heatsink by tightening the M3x30 screw using a 2.0mm hex key.

  • The thermistor cables should go through the gap located at the bottom of the heatsink.
  • Zip-tie the heatsink's thermistor to the heatercore's cables to provide strain relief for the thermistor.
  • Make sure that the Revo spring is attached to the top of the heatercore.

  • This step is valid for both Roto and Roto Sensored.
  • Attach the hotside to the heatsink.

  • Screw the nozzle through the hotside and into the heatsink using only your fingers.

  • Place the 2/3-wire fan on the heatsink as shown below, and tighten it using M3x35 screws.

  • 3-wire fan goes with the Sensored Roto, and the 2-wire fan goes with the standard Roto.
    • This step is valid for both 2 and 3-wire fans.
    • Be mindful of the fan's orientation, the sticker should be placed towards the heatsink!
    • Mount the fan at a preferred angle, ensuring that its cables are positioned nearest to the wiring loom.
  • Screw in the bowdaptor at the bottom of the heatsink (bowden variant only)

Upgrade Guide

Firmware/Printer Config

Basic option (Roto standard) SD Card Upload

  • Revo Roto Prusa EPROM commands
  • If you are pairing the Revo Roto with a Prusa MK3/S/S+, make sure to install the latest E3D Revo firmware alongside the Revo Roto firmware

Advanced option (Roto sensored) Full firmware flash

Prusa MK3

Prusa MK3S

The experimental menu is not activated by default on Prusa printers. To activate it, make sure to follow the official Prusa guide below: 

Then, navigate to LCD menu -> Settings -> HW Setup -> Experimental, and make sure to turn off: 
- ALTFAN det.
- E-cool mode 

Reference CAD

Compliance

Roto complies with the following standards:

  • CE Marking
  • RoHS Compliant
  • REACH Compliant