This part addresses a mechanical wear issue in the stock Creality K1 / K1 SE toolhead PTFE inlet design that became exacerbated when used with the CFS.

Print Use PLA or PETG Print as oriented, no supports 50% infill (gyroid) Screw and PTFE tube should be snug fit.

Problem

The PTFE tube feeding the extruder is retained only by a push-fit collet. During normal operation, the moving toolhead introduces both lateral wobble and torsional motion. Over time, the teeth in the collet wear gouges in the PTFE tube making it impossible to remove without breaking the collet. When the CFS is introduced into the system, the lateral wobble prevents the CFS from loading the filament due to misalignment of the PTFE tube with the internal toolhead channel

Solution

This redesigned PTFE support created from scratch in FreeCAD, replaces the original factory printed tower and adds a guided support arm that constrains the PTFE tube above the collet.

The design eliminates lateral load at the collet and allows controlled axial movement only. This reduces PTFE wear to a clean, predictable circular contact and prevents filament misalignment during CFS loading. The support arm provides guided compliance, not rigid clamping, preserving smooth filament feed while removing destructive wobble.

Design Features Direct replacement using the original mounting screw with no modification to the toolhead or extruder

Why This Exists This design formalizes a field-tested fix developed after a PTFE collet failure during an active print. The root cause was identified as lateral instability at the collet — not insufficient axial retention.

This part corrects the load path.