Image 1/1: Be extremely careful, otherwise you can burn yourself
  • Before you start, keep in mind that you're going to work near elements which has more than 200'C

  • Be extremely careful, otherwise you can burn yourself

  • If you want to leave the nozzle heated all the time (NOT RECOMMENDED), be even more careful and try not to burn the cables from extruder motor and other stuff

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Image 1/2: Unscrew the nozzle with pliers (or better with 7 mm spanner) while holding the heater block with 17 mm spanner Image 2/2: Unscrew the nozzle with pliers (or better with 7 mm spanner) while holding the heater block with 17 mm spanner
  • Preheat the nozzle to 240'C

  • Unscrew the nozzle with pliers (or better with 7 mm spanner) while holding the heater block with 17 mm spanner

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Image 1/1: It's recommended to turn off the heating. But it's not necessary.
  • Unscrew the nozzle tip completely

  • It's recommended to turn off the heating. But it's not necessary.

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Image 1/2: Image 2/2:
  • Using 2.5 mm hex spanner unscrew all four screws (M3x18 mm) holding the nozzle fan

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Image 1/3: Image 2/3: Image 3/3:
  • Using 2.5 mm hex spanner, unscrew two screws ( M3x40 mm ) holding the extruder on the x-carriage

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Image 1/3: M3x40 mm holding the idler (try not to shake off all those springs a washers :) ) Image 2/3: M3x30 mm holding the extruder motor Image 3/3: M3x30 mm holding the extruder motor
  • Using 2.5 mm hex spanner unscrew following screws:

  • M3x40 mm holding the idler (try not to shake off all those springs a washers :) )

  • M3x30 mm holding the extruder motor

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Image 1/2: Image 2/2:
  • Remove plastic parts from nozzle

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Image 1/1:
  • Grab the heater block with pliers and unscrew the nozzle body

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Image 1/2: Using your nail push the black ring Image 2/2: Extract the PTFE tube from the nozzle body
  • Grab the PTFE tube with pliers

  • Using your nail push the black ring

  • Extract the PTFE tube from the nozzle body

  • It may need some force, so don't worry to use some

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Image 1/2: The PTFE tube should be released around 2 mm on the other end Image 2/2: The PTFE tube should be released around 2 mm on the other end
  • Insert the new PTFE tube to the nozzle body

  • The PTFE tube should be released around 2 mm on the other end

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Image 1/1: Using a blade, cut the PTFE tube
  • Hold the other end of the PTFE tube

  • Using a blade, cut the PTFE tube

  • It's critical that the cut has to be perfectly perpendicular and straight

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Image 1/3: Screw the nozzle back to the heater block (from the dirty side) as deep as you can Image 2/3: Unscrew the nozzle tip by 1/4 to 1/2 turn Image 3/3: Unscrewing the nozzle tip is critical! Don't forget that!
  • Using the blade, scrap the degraded filament from the face of the nozzle tip

  • Screw the nozzle back to the heater block (from the dirty side) as deep as you can

  • Unscrew the nozzle tip by 1/4 to 1/2 turn

  • Unscrewing the nozzle tip is critical! Don't forget that!

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Image 1/2: Be careful when screwing the nozzle body, it's good to hold the nozzle tip to prevent its movement Image 2/2: Be careful when screwing the nozzle body, it's good to hold the nozzle tip to prevent its movement
  • Screw the nozzle body to the heater block as deep as you can

  • Be careful when screwing the nozzle body, it's good to hold the nozzle tip to prevent its movement

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Image 1/1: Press the PTFE tube in the nozzle body as possible
  • Use your nails to keep the black ring as far from nozzle as possible

  • Press the PTFE tube in the nozzle body as possible

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Image 1/2: If you turned off the nozzle heating, heat the nozzle back to 240 'C Image 2/2: If you turned off the nozzle heating, heat the nozzle back to 240 'C
  • Tighten the nozzle tip as much as possible

  • If you turned off the nozzle heating, heat the nozzle back to 240 'C

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Image 1/2: It's recommended to turn off the heating. But it's not necessary. Image 2/2: It's recommended to turn off the heating. But it's not necessary.
  • Put the printed parts on the nozzle

  • It's recommended to turn off the heating. But it's not necessary.

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Image 1/2: PTFE tube should be aligned with the edge of the printed part Image 2/2: PTFE tube should be aligned with the edge of the printed part
  • Use blade and cut the PTFE tube as shown on picture

  • PTFE tube should be aligned with the edge of the printed part

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Image 1/2: Use a blade and cut the edges inside the PTFE tube as shown in picture Image 2/2: Best way how to do that is by inserting the blade inside the tube and rotating the blade several times
  • It's extremely critical to be careful here! Don't allow to fall any part of cut PTFE inside the nozzle!

  • Use a blade and cut the edges inside the PTFE tube as shown in picture

  • Best way how to do that is by inserting the blade inside the tube and rotating the blade several times

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Image 1/1: Don' forget to correct orientation (Cables from the nozzle should face towards the part with visible motor screws and Idler bearing should be visible as shown in picture )
  • Place the printed parts with idler back on the nozzle

  • Don' forget to correct orientation (Cables from the nozzle should face towards the part with visible motor screws and Idler bearing should be visible as shown in picture )

  • Use M3x30 mm screws and mount the motor on the printed parts (Cables from motor should face towards the nozzle)

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Image 1/1:
  • Using M3x40 mm screws, mount the extruder back on the printer

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Image 1/1: Don't forget to guide the cables from motor through the cutout above the fan
  • Using M3x18 mm screws, mount the fan back on the extruder

  • Don't forget to guide the cables from motor through the cutout above the fan

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Image 1/1:
  • Place and tighten the M3x40 mm screws with springs and washers in the extruder idler

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Image 1/1:
  • Load the filament and you're ready to print again!

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Finish Line

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Josef Prusa

Member since: 01/05/2015

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2 Comments

What would the indicators of a bad PTFE Tube be? Are there any specific PTFE tubing that Prusa recommends?

Les DeFoor - Reply

Hello :)

One of the first indicators is a motor skip during printing, over time temperature is affected too. As the tube deteriorates, the force needed to extrude is increased and so the printer will need a higher temperature to print successfully.

We recommend that you keep using E3D PTFE tubing, as found here: http://e3d-online.com/Bowden-Tubing-1.75...

Prusa 3D Watchdog -

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