The re:3D All-Metal Hot End enables your Gigabot to print with high-temperature materials of up to 300°C (with thermistor) and 400°+C (with thermocouple) reliably. You can also change nozzle sizes between 0.4 and 0.8 for different extrusion rates. Its rugged, long-lasting design is engineered for longevity, featuring an electroless nickel plating coating for added durability.
While the re:3D All-Metal Hot End is capable of printing high-tensile and high-strength materials, we recommend upgrading to the Hardened Steel Nozzle if you wish to print with abrasive materials like carbon-filled polymers.
Important Safety Information: Disconnect your Gigabot from power and make sure it is turned off during the following process!
A PDF guide with photos can be found here.
Removing the J-Head Hot End:
- Remove any filament from the hot end.
- Turn off your Gigabot and disconnect from power.
- Remove the head junction box cover and disconnect the heater cartridge and thermistor connections.
- Remove the hot end from the extruder.
Installing the All-Metal Hot End:
- Assemble the hot end using the manufacturer's instructions.
- Install the hot end into the extruder.
- Attach the heater cartridge and thermistor leads to the screw terminals in the head junction box.
- Replace the cover on the head junction box.
- Route the wires neatly from the junction box to the hot end.
Updating Gigabot Firmware:
New firmware is required to properly run the re:3D All-Metal Hot End. E3D Hot End firmware and instructions can be found here.
The two changes in the firmware are as follows:
- Thermistor setting for the temperature sensor (#5 in Marlin thermistor table.)
- Temperature limit raised to 300°C.
- Plug in your Gigabot.
- Power on your Gigabot.
- Check the Viki display to ensure temperature sensor is reading correctly.
- Set hot end temperature to 100°C and verify temperature is reached after 30 seconds.
- Set hot end temperature to 200°C and verify temperature is reached after an additional 30 seconds.
- Observe the temperature for two minutes. Ensure temperature does not vary more than 1-2 deg C.
If the Hot End Temperature is Not Stable:
Perform PID (proportional–integral–derivative) tuning following these instructions:
- Connect your Gigabot's power and USB cables.
- In Pronterface, connect to your Gigabot.
- Turn on the head fan by typing "M106 S255" command in the lower right corner of Pronterface.
- If you have previously been printing, wait for the hot end to cool.
- In Pronterface, type “M303 S200” into the data entry box at the lower right corner. This will start the PID auto-tune function in the Marlin Firmware. The hot end will cycle the heat up and down for a couple minutes until displaying the message: "PID Autotune Complete."
- Write down the last set of output values given.
- Classic PID
- Kp: 50.03
- Ki: 1.98
- Kd: 150.98
Adjusting the Firmware:
- In Pronterface, disconnect from your Gigabot. Close Pronterface, then restart Pronterface.
- Connect to your Gigabot.
- In Pronterface, type into the data entry box at the lower right corner: "M301 P(your Kp value) I(your Ki value) D(your Kd value)".
- It should look like this using the example above: "M301 P50.03 I1.98 D150.98" This will temporarily change the current settings for the temperature controller.
- In Pronterface, type into the data entry box at the lower right corner: "M500". This will store the changes.
- In Pronterface: Set hot end temperature to 200°C and ensure that it comes up to temperature, overshoots the target temperature slightly, undershoots the target temperature slightly, and then settles onto the target temperature within 1-2 deg.