TPU / flexible adapter for Centauri Carbon 2

• UPDATE -

I have updated the model based on your feedback and reported issues:

the splitter is now detachable from the main cover body, using a snap-fit system. To insert it, slightly pry from the left edge and snap the tab into the cover;
internal filament path has been slightly improved for smoother feeding;
added two versions: a fully printed one and one with a push-fit ECAS 04 adapter (I’m not a fan of PC4-M10 fittings);
Please follow the instructions from the previous version below (PTFE tube cutting length has been updated).
I did not find it necessary to add locking systems on the lower splitter inlets, as this does not cause issues regardless of printing tolerances.

Files to download for FULLY PRINTED version:

COVER TPU CC2_v2
SPLITTER FULLY PRINTED
COLLET
THREADED CAP
Files to download for ECAS 04 version:

COVER TPU CC2_v2
SPLITTER ECAS 04
Happy printing!!

...

• Older version -
  I designed this adapter to enable reliable TPU printing on Centauri Carbon 2, completely avoiding the repeated disassembly / reassembly steps required by the stock workflow.

This modification replaces the outer part of the original top cover with a printed component. Once installed, it can stay in place permanently, since the connection between CANVAS slot #4 and the extruder is preserved (please see instructions).

Inside, a splitter is integrated:

internal input → connected to CANVAS port #4, preserving its functionality
external input → dedicated to TPU (manual insertion)
Tested with TPU 95A: no problems.

Likely compatible with softer TPU (e.g. 85A), thanks to optimized and low-friction paths. Tests were carried out using PTFE with 2 mm inner diameter. A 2.5 mm inner diameter is recommended if available. It is possible to reuse the original tubes by modifying them.

I printed it in PETG and had no issues (PLA not recommended if you print ASA or similar with heated chamber)

BOM (optional)
PTFE 46.0 cm
PTFE 11.7 cm
PTFE 18.0 cm (non-critical length)
Assembly instructions (see photos)
Remove the outer part of the top cover
Install the new component (same mounting system as the original)
Remove the PTFE from CANVAS port #4
Remove the corresponding PTFE from the extruder multi-input (using the STL tool provided by Elegoo for release: bit.ly/4t0Rz8w)
Connect the 11.7 cm PTFE between CANVAS (port #4) and the internal input of the new component
Connect the 46.0 cm PTFE between the extruder hub and the top output of the new component
Connect the 18.0 cm PTFE to the external input (optional). - Insert TPU manually from here -
Turn off the printer, disconnect the connector going to the CANVAS and turn the printer back on. The firmware will automatically switch to single filament mode with manual feed. Repeat the operation in reverse to return to multi-material mode.
Notes:

Remove the “inverted T-shaped” support on the back of the component, added to prevent support detachment during printing
If no additional PTFE is available, the original tube (from CANVAS port #4) can be cut to 11.7 cm. Use this piece as described in step #5. This modification is not reversible. The external input can also be left without PTFE, without affecting functionality