Trianglelab Dragon SF hotend with metal heatbreak — standard flow, V6 and Voron

Trianglelab Dragon SF hotend for 1.75 mm filament, with a metal heatbreak, standard-flow melt zone and a rigid structure designed for either V6 groove mounting or direct screw mounting. It is the balanced version of the classic Dragon family, intended for general use where mechanical stability and a shorter melt zone are preferred over the extra flow potential of the HF model.

This version must not be confused with the ceramic-heatbreak Dragon V2. The heater cartridge and temperature sensor are selected separately, allowing voltage, power and sensor curve to be matched to the printer electronics.

Why choose the Dragon SF

SF means Standard Flow. Its shorter melt zone is suited to low-to-medium flow work, common nozzle sizes and frequently used materials. Compared with the Dragon HF, it provides a general-purpose configuration without adding an extended hot zone that may not be needed.

• Rigid frame that transfers mounting and maintenance loads through the hotend structure.
• Metal heatbreak with no PTFE in the hot zone.
• Compact heater block with silicone sock.
• M6 thread for V6-format nozzles.
• Included Groove Mount adapter plus an alternative four-screw M2.5 rigid mount.
• Shared outer geometry with the HF version, allowing flow class to be changed without necessarily redesigning the complete toolhead.

Dimensions and interfaces

Voron and V6 mounting compatibility

The official Voron Stealthburner project supports Dragon ST, SF and HF hotends through the P-DRG printhead. For this arrangement, remove the Groove Mount adapter to expose the rigid mounting points and use four M2.5 × 8 mm screws. This is suitable for Voron 2.4 and Voron Trident machines fitted with the matching Stealthburner revision and printed parts.

The upper adapter also enables mechanical integration into V6-style supports used by many Prusa i3-derived, Titan, BMG/DDB and RepRap designs. A matching interface does not by itself guarantee a drop-in conversion. Check nozzle height, cooling, probe position, heater, sensor, wiring and configuration separately.

Select the heater and sensor separately

The hotend is supplied without a heater cartridge or temperature sensor. It can be completed with a 12 V 40 W heater cartridge, a 24 V 40 W heater cartridge or a 24 V 50 W heater cartridge. Confirm that the power supply, controller output, MOSFET, connectors and wiring are rated for the selected voltage and power.

For a straightforward setup, use the 3 mm encapsulated 100K Beta 3950 NTC thermistor with XH2.54 connector. The 3 mm diameter confirms only the mechanical fit; connector, pinout and firmware curve must be verified independently.

Firmware setup with a 100K Beta 3950 NTC

These values apply only to the linked B3950 sensor, not to every 100K thermistor. Before heating, confirm a plausible ambient reading. Observe the first heat-up, keep thermal protection enabled and retune PID or MPC after changing heater power, block, sensor or airflow.

Installation and first calibration

1. Confirm the mounting method, heater voltage and power, sensor type and connector pinout.
2. Fit the heater and sensor fully into their bores without crushing the sensor capsule or damaging wire insulation.
3. Provide continuous, correctly directed airflow over the heatsink whenever the hotend is hot.
4. Ensure the nozzle seals against the heatbreak rather than bottoming out against the heater block.
5. Complete the final hot tightening within the safe temperature range of every installed component. The classic Dragon manual specifies 285 °C, one minute of thermal equalisation and approximately 2.5 Nm while holding the block with a spanner.
6. Recalibrate Z offset, heater control, temperature, retraction, flow and pressure/linear advance.
7. Check for leakage after the first heating and cooling cycles.

Nozzles and materials

The included 0.4 mm V6 nozzle is a general-purpose starting point. Other M6 V6-format nozzles may be used after confirming length and sealing geometry. A Trianglelab T-V6 0.4 mm brass nozzle prioritises thermal conductivity for ordinary materials. For carbon fibre, glass fibre, glow or other abrasive fillers, choose a wear-resistant nozzle such as the 0.4 mm A2 hardened-steel V6 nozzle and retune temperature or speed if necessary.

The metal heatbreak removes PTFE from the hot zone, but it does not make the complete printer automatically suitable for every polymer. Material compatibility also depends on the actual sensor range, heater, nozzle, extruder, chamber, ventilation and machine construction.

Is it for you?

It is for you if you want a rigid, serviceable Dragon hotend for general 1.75 mm printing, your toolhead supports V6 groove mounting or the Dragon four-screw pattern, and standard flow is sufficient for your intended layer height, nozzle and speed.

It is not for you if your goal is maximum volumetric flow, you need a complete pre-wired heater and sensor assembly, or you have not yet verified toolhead geometry and electronics. For more melt capacity, consider the Dragon HF with metal heatbreak. For the newer ceramic-heatbreak generation, see the Dragon V2 SF.

Package contents

• Trianglelab Dragon SF hotend body with heatsink, metal heatbreak and heater block.
• Silicone heater-block sock.
• 0.4 mm V6-format nozzle.
• V6/Groove Mount adapter, filament inlet fitting and retaining clips.
• Mounting screw and tool set shown in the product gallery.

Heater cartridge and temperature sensor are not included.