Improved mounts for Filament Track Switch & TPU Assist - looking for Feedback

Bambu Lab H2 Series
1

Hi everyone,
I’m currently working on improved mounts for the Filament Track Switch and TPU Feed Assist modules for the H2C/H2D printers. My main goal is to further reduce filament feeding resistance and make the size even more compact.

I am currently testing two different concepts and would love to get your input before publishing. The current version 2 can be seen in the first image.

The new versions 3 and 4 bring the following improvements:

Version 3 (picture 2, orange mount):

  • More compact and space-saving design.

  • Warp-resistant: Significantly reduced surface area against the heated back panel (no warping when chamber heating is active).

  • Improved routing: Lower TPU module position for a straighter filament path and much better compatibility with custom Riser systems.

Version 4 (pictures 3+4, white mount):

  • New approach, new model: The Track Switch is rotated by 90 degrees, lying flat and aligned inline with the filament inlets.

  • This enables the straightest possible filament path with minimal resistance.

  • Trade-off: It requires more space behind the printer as cables and tubes protrude at an angle.

Shared features across both models:

  • Thanks to the reduced contact area and redesigned mounting points, both mounts can now safely be printed in PETG without risking deformation from printer exhaust heat.

  • Adjustable distance between the Track Switch and the filament inlets.

  • Both models will include an optional variation with the TPU module rotated by 90 degrees to the side.

Which one should you choose?

  • If you have enough space behind the printer, I recommend to print version 4 (best possible feeding physics), otherwise version 3.

  • If you have already printed Version 2 and it works fine for you, there is no need to reprint!

Your feedback is appreciated:

  1. What do you think about these two approaches? Which one fits your setup better?

  2. Have I missed something? Do you see any further improvements I should implement before finalizing the files?

Note:
These are currently functional prototypes. I plan to release the final files after the summer break (around mid-August).
You can find my current designs on my MakerWorld profile @Steibock_3D

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2

If the goal is to reduce filament feed resistance, yes you’ve reduced resistance between the FTS and the printer, but lining the components up like that just pushes the connection point for the AMS units further and further from the printer - if users want to stack AMSes on top of the printer the PTFEs will be getting longer than whatever was saved with this mod.

The only way this makes sense is if users want to locate their AMS units next to the printer, I’m not sure many people will go for that.