H2C Front PTFE Holder Upgrade (incl. TPU Inserts)

This component is a modification of the front PTFE cable clip for the Bambu Lab H2C

With the standard front PTFE holder, when the print head moves back and forth during nozzle changes, the holder and the PTFE cables collide with the lamp. The cables particularly rub against the side where the print head moves for nozzle changes. In my case, there was already visible abrasion. Long-term consequences are not foreseeable, but abrasion is present

This component does not replace the entire assembly, but only the front PTFE cable chain clip on the drag chain

Update (Fit on drag chain improved)

It was noted (partly due to user feedback) that in some cases, the holder does not sit firmly enough on the drag chain and can move easily

To improve this, the dimensions in the mounting area were minimally adjusted. Additionally, the two pins that grip into the drag chain were extended:

• upper pin from 0.3 mm → 0.6 mm
• lower pin from 0.5 mm → 0.8 mm

This allows them to grip deeper into the drag chain and reliably prevent slipping

The updated version has already been uploaded – please re-download the files to get the adjustment

What was changed

• The front PTFE cable clip was re-engineered, not completely redesigned
• Locking mechanism like the original
• The original rubber inserts are reused
  → can be carefully pushed out of the original part with an Allen key or similar tool
  → fit into this part without post-processing
• The two PTFE guides have been adjusted:
  • the middle opening was slightly offset downwards
  • this makes the cables converge more closely at the bottom (see images)
• The upper guide was intentionally removed, as it is not currently needed
  → if you need it, you should use a different design

Optional TPU Rubber Inserts (additional print profile)

In addition to the holder, a matching set of rubber inserts has been added as a separate print profile

These inserts are only necessary if:

• multiple holders are to be mounted along the drag chain
• the original inserts are not to be removed
• replacement is needed

The inserts are designed for printing with TPU

Printing notes:

• the softest possible TPU is recommended
• TPU 95A was tested, which is already relatively hard
  → it fits, but is a bit fiddly to insert
• it was printed with PLA support structure, which worked reliably

The inserts fit into the holder without post-processing

Assembly instructions

• Assembly is performed at the same position on the drag chain
• It is recommended to note or mark the original position before removal
• A different position is generally possible, but may require repeated readjustment
• After assembly, be sure to check:
  • free movement of the cables
  • no excessively tight bend radii
  • no unfavorable kinks that could cause filament problems

Design note (important)

This component does not use a hinge.
As with the original, a thin web is used, which is stretched during attachment

⚠️ Important:
This design is unsuitable for brittle or very fragile materials, as the web is briefly subjected to high stress during assembly

After installation, the web is not permanently under tension

If you prefer a solution with a hinge, you should consider alternative designs – suitable solutions already exist

🔧 Revision of thickness in the bending area (drag chain attachment)

During assembly – as with the original – the holder must be slightly bent in the drag chain attachment area to snap it into place

Occasionally, there were problems with this area breaking

Therefore, in the print profile, in addition to the previous version with 0.4 mm, a reinforced variant with 0.6 mm thickness in the bending/movement area was added.
This aims to increase stability and reduce the risk of breakage

My own experience:
The 0.4 mm version (printed from ABS with a 0.2 mm nozzle) could be assembled and disassembled multiple times without breaking – provided it is only bent as far as necessary

For users who still encounter problems, the reinforced variant is available

Material & Print

• Printed with 0.2 mm nozzle
• Layer height arbitrary
• Tested in ABS

ASA would generally also be suitable due to its heat resistance, but according to Bambu Lab recommendations, it is not intended for printing with a 0.2 mm nozzle.
For this reason, ABS was used, which easily withstands the temperatures occurring in the printer