Machined PTFE Tube for PEEK Isolator of J-head Hotend.
Size: ID2 mm OD6 mm L22mm for 1.75mm filament to be through.
Heat Barrier in Certain Hot End Designs
Beyond its role in Bowden systems, PTFE tubing also finds application in specific hot end designs, often as a short internal liner within the heat break component. The heat break is a critical section of the hot end that aims to create a sharp thermal transition zone, preventing the heat generated in the heating block (where the nozzle is attached) from migrating upwards towards the cooler parts of the hot end and the extruder assembly. A thermal barrier is established by incorporating a PTFE liner within the heat break. This helps maintain a well-defined melting zone for the filament, ensuring it only softens and melts precisely where intended, just before entering the nozzle. Furthermore, the inherent anti-stick properties of PTFE are advantageous in this context, as they prevent any softened filament from adhering to the inner walls of the heat break, a phenomenon that could otherwise lead to the formation of clogs and subsequent printing failures.
