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Cannot get replacement PTFE tube into the hotend

I have just bought a length of PTFE tube from you to replace the one in my hotend, and it is so tight as it goes into the heatsink, the tube bends trying to insert it. It goes through the collet ok, but seems to have problems going through the "throat".

Any suggestions?

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Hi Berriman, when you look at the PTFE end on (cross-section) is the hole fully round or is it miss-shapen? Try cutting the PTFE with a sharp knife as square as you can.

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Thanks Dan. I've tried several pieces now (all cut with a sharp knife). None go through. I also tapered the end slightly to see if that helped - not really. I've removed the retaining clip altogether, so it's purely something in the hotend or the ptfe.

The cross section appears round, yes.

Using electronic calipers shows the outer diameter of the ptfe is 4.2mm - is this normal?


are you using 1.75 or 3mm filament with your v6? you should contact as you may have the wrong diamter PTFE.


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Mike Berriman will be eternally grateful.
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