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Why does E3D V6 Gold HotEnd kit include PTFE tube with smaller ID?

I am assembling E3D V6 Gold HotEnd kit for Anycubic Mega-S. The V-6 kit includes a section of PTFE tubing (blue) with same OD as white tube that came with the Mega-S, but the ID is noticeably smaller. I am wondering if I should use it?

On my Mega-S printer, filament that has been fed into the bowden tube (and then retracted of course or I wouldn’t be able to see/notice it) has notches on it. You can easily feel the tiny jagged marks left by the bowden drive feed mechanism. Unused 1.75mm filament fits through the new smaller ID tubing fine. But if I try to push filament that has been through the feeder and retracted, it jambs. As I feed more of this filament into the smaller ID tube, it gets harder and harder to push. That can’t be good?

Any one have any suggestions? Should I stick with the original tube? Should I not be getting these notches on my filament?


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Hi John,

The tighter tolerance mean less overall lag in the extrusion system than with standard PTFE (shorter retraction lengths and less coasting required). If the extruder is creating notches enough to change the effective diameter of the filament it may indicate you have the tension set too high for the filament you are using.

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Hi Dan:

Great answer and I thank you much! Good to know there is a tension adjustment. Now I know what that knob is for!

Changing to this V6 hotend on my Mega-S has been a terrible experience for me. It goes way beyond the wiring connectors being different and the fact that the V6 does not even fit my machine. I also had to upgrade the Mega-S firmware to use the V6 (many thanks to David Ramiro), obtain a raspberry pi and software to be able to communicate with and tweak the firmware (thanks and Gina), new fasteners/spacers, tools, and more. That may be the case for other machines too?

For the Mega-S, I found only one source that takes you through the whole process of installing the V6 and calibrating it (many thanks to 3D Printing Tech Channel) but required Simplify3D. I still had to borrow from several other helpful videos and instructions. NOWHERE did I find an overview of the complete process explaining what needed to be done and why. I would be willing to help someone put that together.


@tom8059 Hi John, Unfortunately, we are unable to provide upgrade guides for every single printer on the market, new brands and printers are constantly being released so it's not practical for us to create guides for all our product variants with all the printer variants available. If you would like to make a video or guide on the particular upgrade you completed and send the information to we can add it to our list of recommended community guides.


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John Petti will be eternally grateful.
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