ATTENTION!!! Please read all instructions at least twice! If you trim or drill the tube improperly, you will have to order it again! READ CAREFULLY instructions for the tools before you proceed further. Prusa Research is not responsible for any harm or injury.
  • ATTENTION!!! Please read all instructions at least twice! If you trim or drill the tube improperly, you will have to order it again!

  • READ CAREFULLY instructions for the tools before you proceed further. Prusa Research is not responsible for any harm or injury.

  • For trimming get a cutting tool with a thin blade. Use either razor or carpet knife. DON'T use kitchen knife.

  • For drilling is recommended to use a drill bit with conic head or you can use a drill bit with diameter 3,5 - 4 mm. The point is to make a conical entrance in the tube.

  • Do you have Multi Material? Use this guide instead: How to trim PTFE tube - Multi Material

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This an ideal shape of the PTFE tube for Original Prusa i3 MK2/S hotend. Given dimensions and angles are recommended values.
  • This an ideal shape of the PTFE tube for Original Prusa i3 MK2/S hotend. Given dimensions and angles are recommended values.

  • All dimensions are in millimetres.

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IT IS CRUCIAL to cut the correct end of the tube, check twice before you start!
  • IT IS CRUCIAL to cut the correct end of the tube, check twice before you start!

  • One end of the tube has "rounded" outer edge. DON'T CUT this part.

  • Look at the other end, where the tube is drilled inside, shape of the edge is "conical". This is the side you CAN CUT.

im wondering what is the best method to round the end of the ptfe tube that goes into the heat break. I have a lenght of pffe tube which i can cut to size to make the inserts for the hotend.

John - Reply

Hi John,

I suggest to use pencil sharpener, it will create this desired rounded edge ;)

Jakub Dolezal -

Take the razor or knife and carefully trim the tube.
  • Take the razor or knife and carefully trim the tube.

  • Don't press too hard during the cutting on the tube, you can deform the circular shape and this will lead to filament jam!

  • Optimal length is 50 mm for MK2/S printer.

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After cutting the tube to appropriate length, you need to renew the conical entrance. Use the drill bit you've prepared in the beginning. You can use electric drill, but set it to low RPM and press very gently.
  • After cutting the tube to appropriate length, you need to renew the conical entrance.

  • Use the drill bit you've prepared in the beginning. You can use electric drill, but set it to low RPM and press very gently.

  • It is important to achieve smooth entrance, so the filament will slide in. Clean the tube from any particles, which might prevent it.

  • That's it! Place the PTFE tube back to the Extruder and continue with the assembly.

What is that type of drill bit called?

Douglas Shelfoon - Reply

Finish Line

2 other people completed this guide.

Jakub Dolezal

Member since: 02/20/2017

68,245 Reputation

132 Guides authored

3 Comments

Nice process update. I think the pencil sharpener and drill ideas make this much easier and safer to complete than the previous method. The additional photos and diagram are excellent as well.

Douglas Shelfoon - Reply

What is the precise length of the PFTE tube for a MK2 ?

Andre Laurendeau - Reply

Hi Andre,

MK2 and MK2S share the same hotend, therefore 50 mm and shape according to the step 2.

Jakub Dolezal -

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