How do you set up three PFTE tubes coming into the H2D two extruders?

Zorzal · July 12, 2026, 4:33pm

This message is for those of you who have three PFTE tubes coming into the H2D from the three designated ports on the back, particularly if you use the TPU assist feeder mod from BL.

Would you please share the following three aspects of your setup:

How long are the PFTE tubes? Did you follow any specific guideline?
How do you route them from the three ports to the two PFTE adapters on the dual idler?
Do you leave the three PFTE tubes in place regardless of which ports you are using?

I ask because the right PFTE adapter has broken four times in the last six weeks or so, and I am convinced the PFTE incoming tubes have something to do with that.

Please note that I asked this same question elsewhere, but it was buried in another thread, so I isolated it here to give it more visibility and see if I can collect any answers.

TIA, I really appreciate your time responding to this query.

Gerrit · July 12, 2026, 5:14pm

I have mine set-up with a printed 2-1 adapter with M10 threaded PTFE couplers.

The 2-1 is printed in PETG with 0.12 mm layer height. I don’t have anything holding the 2-1 in place so it can move freely. It’s only constrained by the 3 tubes. The exit side is very close to the clamp on the cable chain, so it’s giving quite some support.

The length of the left tube is 15mm longer than the original that it came with. This gives less stress on the filament buffer when you print near the left front.

I don’t have the exact lengths of the right side tubes at hand, but I started a bit to long and trimmed back as required.

Here some pictures:

On the last 2 images, the tool head is parked at the front left.

Zorzal · July 12, 2026, 5:48pm

Thanks for such detailed and info-packed response, @Gerrit – you even took the time to take perfect pictures to illustrate your response!

Three take backs from your layout:

It had not occurred to me to join the two tubes that go to the right extruder (despite using that setup on my X1C and A1). I love the idea because it spreads the bending tension of the incoming PTFE tube along a longer piece of tube, as opposed to bringing the tube in and bending it closer to the connector). Awesome.
I also see that you have a PTFE connector and tube coming in between the right and left ports, on the back of the printer. Is that standard on your printer? What do you use that for? My H2D does not have that port (see two pictures below)
Reminded me that the correct abbreviation for polytetrafluoroethylene is PTFE, not PFTE

Thanks again for your response!