How to trim PTFE tube - MK2/S, MK2.5 andMK3

Written By: Jakub Dolezal

How to trim PTFE tube - MK2/S, MK2.5 and MK3

© 2018 manual.prusa3d.com/ Page 1 of 5

Step 1 — Introduction & proper tools

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 notresponsible for any harm or injury.

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

For drilling is recommended to use a drill bit with conic head or you can use a drill bit with diameter3,5 - 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

How to trim PTFE tube - MK2/S, MK2.5 and MK3

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Step 2 — Ideal shape of the PTFE tube

This an ideal shape of the PTFE tube for Original Prusa i3 printer. Given dimensions and anglesare recommended values.

The ideal shape for the MK2, MK2S, MK2.5 and MK3 hotend.

The ideal shape for the MK2.5 and MK3 extruder (top part of the filament cover).

All dimensions are in millimetres.

How to trim PTFE tube - MK2/S, MK2.5 and MK3

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Step 3 — Where to trim the tube (important)

IT IS CRUCIAL to cut the correctend of the tube, check twice beforeyou start!

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

Look at the other end, where thetube is drilled inside, shape of theedge is "conical". This is the sideyou CAN CUT.

Step 4 — Trimming the PTFE tube

Take the razor or knife and carefullytrim the tube.

Don't press too hard during thecutting on the tube, you can deformthe circular shape and this will leadto filament jam!

Optimal length is 50 mm for MK2/S,MK2.5 and MK3 printer.

How to trim PTFE tube - MK2/S, MK2.5 and MK3

© 2018 manual.prusa3d.com/ Page 4 of 5

This document was last generated on 2018-06-25 03:00:16 PM.

Step 5 — Drilling the tube's edge

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 RPMand press very gently.

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

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

How to trim PTFE tube - MK2/S, MK2.5 and MK3

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