Stainless Steel M6 Thermal Barrier Throat – PTFE Lined Heat Break for MK8 & RepRap 3D Printer Extruders

Overview

Are you experiencing mid-print failures where your extruder suddenly stops pushing filament after 30 to 40 minutes of flawless printing? That is a classic symptom of a worn-out or poorly insulated heat break. Our M6 Thermal Barrier Throat is engineered from high-grade stainless steel—a metal specifically chosen for its low thermal conductivity. By restricting the upward travel of heat from the heater block, this throat maintains a sharp, reliable melt zone for consistent extrusion.

Key Features

• PTFE Liner Integration: Features an internal 2mm ID Teflon tube that runs through the bore, providing an ultra-low-friction pathway that prevents sticky filaments (like PLA) from adhering to the metal walls.

• Low Thermal Conductivity: Machined from structural stainless steel to naturally resist heat transfer, protecting your cold-end heatsink.

• Precision M6 Threading: Fully threaded exterior ensures a tight, leak-proof mechanical seal against both the aluminum cooling block and the heater block.

• Smooth Internal Bore: Buffed and finished internally to eliminate microscopic machining ridges that catch on flexible or brittle filaments.

Technical Specifications

⚠️ Temperature Capability Note: Because this throat contains an internal PTFE lining, it is optimized for smooth, low-effort printing of PLA, TPU, and standard PETG. For safety and part longevity, do not run this specific throat above 250°C, as the internal Teflon liner will begin to degrade and emit fumes. For high-temperature nylon or polycarbonate printing, an “All-Metal” titanium variant is required.